Upgraded JRE level to 1.6; upgraded Commons IO to version 2.4; upgraded JUnit to version 4.11

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpasyncclient/trunk@1586756 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 45c64b4..fa99d7d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -64,14 +64,13 @@
   </scm>
 
   <properties>
-    <maven.compiler.source>1.5</maven.compiler.source>
-    <maven.compiler.target>1.5</maven.compiler.target>
+    <maven.compiler.source>1.6</maven.compiler.source>
+    <maven.compiler.target>1.6</maven.compiler.target>
     <httpcore.version>4.3.2</httpcore.version>
     <httpclient.version>4.3.3</httpclient.version>
     <commons-logging.version>1.1.3</commons-logging.version>
-    <!-- Note IO 2.3+ requires Java 6 -->
-    <commons-io.version>2.2</commons-io.version>
-    <junit.version>4.8.1</junit.version>
+    <commons-io.version>2.4</commons-io.version>
+    <junit.version>4.11</junit.version>
     <easymock.version>2.5.2</easymock.version>
     <mockito.version>1.8.5</mockito.version>
     <hc.stylecheck.version>1</hc.stylecheck.version>