Updated pom versions
diff --git a/pom.xml b/pom.xml
index a356f61..95bfe2a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -46,12 +46,50 @@
     <!-- End Project Information -->
 
     <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <project.build.resourceEncoding>UTF-8</project.build.resourceEncoding>
-        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-        <maven.compiler.source>1.8</maven.compiler.source> <!-- TODO-JDK9: 1.9 -->
-        <maven.compiler.target>1.8</maven.compiler.target> <!-- TODO-JDK9: 1.9 -->
+        <!-- System-wide properties -->
         <argLine>-Xmx4g -Duser.language=en -Duser.country=US -Dfile.encoding=UTF-8</argLine>
+        <charset.encoding>UTF-8</charset.encoding>
+        <project.build.sourceEncoding>${charset.encoding}</project.build.sourceEncoding>
+        <project.build.resourceEncoding>${charset.encoding}</project.build.resourceEncoding>
+        <project.reporting.outputEncoding>${charset.encoding}</project.reporting.outputEncoding>
+        <java.version>1.8</java.version> <!-- TODO-JDK9: 1.9 -->
+        <maven.compiler.source>${java.version}</maven.compiler.source>
+        <maven.compiler.target>${java.version}</maven.compiler.target>
+
+        <!-- Dependencies -->
+        <testng.version>6.14.3</testng.version>
+        <protobuf-java.version>3.6.0</protobuf-java.version>
+        <findbugs.version>3.0.1</findbugs.version>
+        <slf4j-api.version>1.7.25</slf4j-api.version>
+        
+        <!-- Maven Plugins -->
+        <maven-assembly-plugin.version>3.1.0</maven-assembly-plugin.version>
+        <maven-clean-plugin.version>3.1.0</maven-clean-plugin.version>
+        <maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
+        <maven-dependency-plugin.version>3.1.1</maven-dependency-plugin.version>
+        <maven-deploy-plugin.version>2.8.2</maven-deploy-plugin.version>
+        <maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>
+        <maven-help-plugin.version>3.1.0</maven-help-plugin.version>
+        <maven-install-plugin.version>2.5.2</maven-install-plugin.version>
+        <maven-javadoc-plugin.version>3.0.1</maven-javadoc-plugin.version>
+        <maven-release-plugin.version>2.5.3</maven-release-plugin.version>
+        <maven-resources-plugin.version>3.1.0</maven-resources-plugin.version>
+        <maven-source-plugin.version>3.0.1</maven-source-plugin.version>
+        <maven-surefire-plugin.version>2.22.0</maven-surefire-plugin.version>
+        
+        <!-- Codehaus.org Maven Plugins -->
+        <exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
+        <license-maven-plugin.version>1.16</license-maven-plugin.version>
+        <plexus-compiler-javac-errorprone.version>2.8.4</plexus-compiler-javac-errorprone.version>
+        
+        <!-- Jacoco.org Maven Plugins -->
+        <jacoco-maven-plugin.version>0.8.1</jacoco-maven-plugin.version>
+        
+        <!-- Sonatype.org Maven Plugins -->
+        <nexus-staging-maven-plugin.version>1.6.8</nexus-staging-maven-plugin.version>
+        
+        <!-- eluder.org Maven Plugins -->
+        <coveralls-maven-plugin.version>4.3.0</coveralls-maven-plugin.version>
     </properties>
 
     <!-- Environment Settings -->
@@ -130,7 +168,7 @@
                                 <dependency>
                                     <groupId>org.codehaus.plexus</groupId>
                                     <artifactId>plexus-compiler-javac-errorprone</artifactId>
-                                    <version>2.8.2</version>
+                                    <version>${plexus-compiler-javac-errorprone.version}</version>
                                 </dependency>
                             </dependencies>
                         </plugin>
@@ -146,25 +184,26 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
-            <version>1.7.25</version>
+            <version>${slf4j-api.version}</version>
         </dependency>
         <!-- Compile, Test Scope -->
         <dependency>
             <groupId>org.testng</groupId>
             <artifactId>testng</artifactId>
-            <version>6.13.1</version>
+            <version>${testng.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
+            <!-- Used for UTF8 testing -->
             <groupId>com.google.protobuf</groupId>
             <artifactId>protobuf-java</artifactId>
-            <version>3.5.0</version>
+            <version>${protobuf-java.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
           <groupId>com.google.code.findbugs</groupId>
           <artifactId>findbugs</artifactId>
-          <version>3.0.1</version>
+          <version>${findbugs.version}</version>
           <scope>test</scope>
         </dependency>
     </dependencies>
@@ -322,116 +361,110 @@
               <plugin>
                   <groupId>org.apache.maven.plugins</groupId>
                   <artifactId>maven-assembly-plugin</artifactId>
-                  <version>3.1.0</version>
+                  <version>${maven-assembly-plugin.version}</version>
               </plugin>
 
               <plugin>
                   <groupId>org.apache.maven.plugins</groupId>
                   <artifactId>maven-clean-plugin</artifactId>
-                  <version>3.0.0</version>
+                  <version>${maven-clean-plugin.version}</version>
               </plugin>
 
               <plugin>
                   <groupId>org.apache.maven.plugins</groupId>
                   <artifactId>maven-compiler-plugin</artifactId>
-                  <version>3.7.0</version>
+                  <version>${maven-compiler-plugin.version}</version>
               </plugin>
 
               <plugin>
                   <groupId>org.apache.maven.plugins</groupId>
                   <artifactId>maven-dependency-plugin</artifactId>
-                  <version>3.0.2</version>
+                  <version>${maven-dependency-plugin.version}</version>
               </plugin>
 
               <plugin>
                   <groupId>org.apache.maven.plugins</groupId>
                   <artifactId>maven-deploy-plugin</artifactId>
-                  <version>2.8.2</version>
+                  <version>${maven-deploy-plugin.version}</version>
               </plugin>
 
               <plugin>
                   <groupId>org.apache.maven.plugins</groupId>
                   <artifactId>maven-gpg-plugin</artifactId>
-                  <version>1.6</version>
+                  <version>${maven-gpg-plugin.version}</version>
               </plugin>
 
               <plugin>
                   <groupId>org.apache.maven.plugins</groupId>
                   <artifactId>maven-help-plugin</artifactId>
-                  <version>2.2</version>
+                  <version>${maven-help-plugin.version}</version>
               </plugin>
 
               <plugin>
                   <groupId>org.apache.maven.plugins</groupId>
                   <artifactId>maven-install-plugin</artifactId>
-                  <version>2.5.2</version>
+                  <version>${maven-install-plugin.version}</version>
               </plugin>
 
               <plugin>
                   <groupId>org.apache.maven.plugins</groupId>
                   <artifactId>maven-javadoc-plugin</artifactId>
-                  <version>3.0.0</version>
+                  <version>${maven-javadoc-plugin.version}</version>
               </plugin>
 
               <plugin>
                   <groupId>org.apache.maven.plugins</groupId>
                   <artifactId>maven-release-plugin</artifactId>
-                  <version>2.5.3</version>
+                  <version>${maven-release-plugin.version}</version>
               </plugin>
 
               <plugin>
                   <groupId>org.apache.maven.plugins</groupId>
                   <artifactId>maven-resources-plugin</artifactId>
-                  <version>3.0.2</version>
+                  <version>${maven-resources-plugin.version}</version>
               </plugin>
 
               <plugin>
                   <groupId>org.apache.maven.plugins</groupId>
                   <artifactId>maven-source-plugin</artifactId>
-                  <version>3.0.1</version>
+                  <version>${maven-source-plugin.version}</version>
               </plugin>
 
               <plugin>
                   <groupId>org.apache.maven.plugins</groupId>
                   <artifactId>maven-surefire-plugin</artifactId>
-                  <version>2.20.1</version>
+                  <version>${maven-surefire-plugin.version}</version>
               </plugin>
 
               <!-- OTHER -->
               <plugin>
                   <groupId>org.codehaus.mojo</groupId>
                   <artifactId>exec-maven-plugin</artifactId>
-                  <version>1.6.0</version>
+                  <version>${exec-maven-plugin.version}</version>
               </plugin>
 
               <plugin>
                   <groupId>org.codehaus.mojo</groupId>
                   <artifactId>license-maven-plugin</artifactId>
-                  <version>1.14</version>
+                  <version>${license-maven-plugin.version}</version>
               </plugin>
 
               <plugin>
                   <groupId>org.eluder.coveralls</groupId>
                   <artifactId>coveralls-maven-plugin</artifactId>
-                  <version>4.3.0</version>
+                  <version>${coveralls-maven-plugin.version}</version>
               </plugin>
 
               <plugin>
                   <groupId>org.jacoco</groupId>
                   <artifactId>jacoco-maven-plugin</artifactId>
-                  <version>0.7.9</version>
+                  <version>${jacoco-maven-plugin.version}</version>
               </plugin>
 
               <plugin>
                   <groupId>org.sonatype.plugins</groupId>
                   <artifactId>nexus-staging-maven-plugin</artifactId>
-                  <version>1.6.8</version>
-              </plugin>
-
-              <plugin>
-                <groupId>com.versioneye</groupId>
-                <artifactId>versioneye-maven-plugin</artifactId>
-                <version>3.11.4</version>
+                  <version>${nexus-staging-maven-plugin.version}</version>
               </plugin>
 
             </plugins>