Set 'compileSdkVersion' to v.19.
Update Gradle plug-in to v.0.10.+.

+ Running `./gradlew install` only works when
  https://github.com/novoda/robolectric-plugin/pull/17
  is deployed to MavenLocal!
Update Gradle plug-in to v.0.11.+.
Update Gradle wrapper to v.1.12.