Ensures JDK 7 cross-compilation
Ensures JDK 7 cross-compilation

Otherwise JDK8 compiles with the JDK 8 class file version.

Transcordia/ringojs,ringo/ringojs,ringo/ringojs,ringo/ringojs,Transcordia/ringojs,ashwinrayaprolu1984/ringojs,ashwinrayaprolu1984/ringojs,ashwinrayaprolu1984/ringojs,Transcordia/ringojs,Transcordia/ringojs,ashwinrayaprolu1984/ringojs,ringo/ringojs