Fix the source and target version in compiler plugin so Maven creates proper Eclipse project configuration files. Bump version to 1.6 because classes in closure-compiler-r706.jar are 1.6 files.
Fix the source and target version in compiler plugin so Maven creates proper
Eclipse project configuration files. Bump version to 1.6 because classes in
closure-compiler-r706.jar are 1.6 files.

philmander/ant-jshint,philmander/ant-jshint