Updated the version of the gradle android plugin to version 0.10+

Test are running properly using: 

    ./gradlew connectedAndroidTest 

The project can be imported into Intellij idea without problems.

I followed [this migration guide](http://tools.android.com/tech-docs/new-build-system/migrating_to_09) to deal with breaking changes when migrating from 0.8+ to 0.9+