Add CI and Code tests to repo

[mariobehling]

Add Travis, Code tests and Gemnasium to repo and add buttons to Readme.

[nikhilrayaprolu]

@mariobehling gemnasium doesn't have support for java http://support.gemnasium.com/forums/236528-general/suggestions/5491458-support-java-android-gradle
they are working on it and it might be available in around 10 weeks.

[nikhilrayaprolu]

@mariobehling we have set up Travis in this pull for auto deployment #16 .
@Orbiter can we have some suggestions on how to proceed regarding the Code tests?

[mariobehling]

@nikhilrayaprolu I have added travis. Regarding code test, just check what is suitable and add it.