Ignore gradle wrapper files
Add Configuration test
Fix 'context.getClassLoader().getClassLoader' -> 'context.getClassLoader()'
Add Cache test
Update travis.yml
Merge branch 'fix_test' of github.com:rejasupotaro/ActiveAndroid into rejasupotaro-fix_test

* 'fix_test' of github.com:rejasupotaro/ActiveAndroid:
  Update travis.yml
  Add Cache test
  Fix 'context.getClassLoader().getClassLoader' -> 'context.getClassLoader()'
  Add Configuration test
  Ignore gradle wrapper files