Upgrade maven.compiler.source and maven.compiler.target to 1.6
diff --git a/pom.xml b/pom.xml
index 5b20c8d..7b77aa1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -177,8 +177,8 @@
   </issueManagement>
 
   <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>
     <commons.componentid>fileupload</commons.componentid>
     <commons.module.name>org.apache.commons.fileupload</commons.module.name>
     <commons.release.version>1.4</commons.release.version>