Add travis badge
Merge branch 'master' of github.com:LapisDev/Commons

* 'master' of github.com:LapisDev/Commons:
  Add missing license headers in the source code.
  Add Gradle files.
Merge branch 'master' of github.com:LapisDev/Commons

* 'master' of github.com:LapisDev/Commons:
  IntelliJ doesn't do new lines at the end of Gradle files..