Change source and target to Java versions to 1.7
Change source and target to Java versions to 1.7

The plugin compiles fine with JDK 1.7 and does not seem to use any 1.8-only syntax/functionailty, as far as I can see. It runs just fine when compiled with JDK 1.7 as well. Maven failed when building this plugin on Ubuntu 14.04, as only OpenJDK 1.7 was installed; 1.8 is not yet available in the Ubuntu package repositories. Updating pom.xml to allow for compilation with JDK 1.7.
Gamealition/ToughBoats,Gamealition/Titanic