Do not ignore Gradle Wrapper and add it back

See issue on `googleplus/gplus-haiku-client-android` repo: https://github.com/googleplus/gplus-haiku-client-android/issues/3
Merge pull request #4 from ViliusKraujutis/master

Do not ignore Gradle Wrapper and add it back
Merge branch 'master' of github.com:googleplus/gplus-haiku-client-android

Conflicts:
	haikuplus/gradle/wrapper/gradle-wrapper.properties