Feature Request: Add support-annotations where appropriate

[yogurtearl]

@ducrohet mentioned these annotations to me. ( they were mentioned here: http://tools.android.com/recent/androidstudio055released )

Use @idres on the id parameter of findById. Android studio will give better code completion.

Gradle include for the annotations is:
com.android.support:support-annotations:+

[JakeWharton]

Already have this completed on a local branch! Was waiting until the next major version (6.0) where the annotation processor gets split from the runtime and the project moves to Gradle (also on a local branch).

[yogurtearl]

👍

[JakeWharton]

Blocked by #362.