[MACR-43] - Upgrade plexus-utils, maven-archiver, plexus-archiver
 o Upgrade maven-archiver to 3.2.0
 o Upgrade plexus-archiver to 3.5
 o Upgrade plexus-utils to 3.1.0
 o Forces upgrade JDK 6 => JDK 7
 o Bump version to 3.1.0-SNAPSHOT
diff --git a/pom.xml b/pom.xml
index 83f28be..baa40a6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -30,7 +30,7 @@
   </parent>
 
   <artifactId>maven-acr-plugin</artifactId>
-  <version>3.0.1-SNAPSHOT</version>
+  <version>3.1.0-SNAPSHOT</version>
   <packaging>maven-plugin</packaging>
 
   <name>Apache Maven ACR Plugin</name>
@@ -62,6 +62,7 @@
   </distributionManagement>
 
   <properties>
+    <javaVersion>7</javaVersion>
     <mavenVersion>3.0</mavenVersion>
   </properties>
 
@@ -89,7 +90,7 @@
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-archiver</artifactId>
-      <version>3.1.1</version>
+      <version>3.2.0</version>
     </dependency>
     <dependency>
       <groupId>org.apache.maven.shared</groupId>
@@ -104,12 +105,12 @@
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-utils</artifactId>
-      <version>3.0.24</version>
+      <version>3.1.0</version>
     </dependency>
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-archiver</artifactId>
-      <version>3.4</version>
+      <version>3.5</version>
     </dependency>
     <dependency>
       <groupId>commons-io</groupId>