Make it working with gradle android 0.9.0 plugin

Summary:
Androdi team recently released gradle android 0.9.0. I had hoped that
they added builtin support for robolectric. However, couldn't make it
working with the examples. Maybe I am missing something?

This plugin works with 0.8.+, but no 0.9.0 due to some breaking changes.
See release note at http://tools.android.com/tech-docs/new-build-system

Here we add 0.9.+ support. Tested it with both: 0.8.x -> 0.9.0
- Rename instrumentTestCompile to androidTestCompile
- Rename src/test/java -> src/androidTest/java
- Install this plugin locally
- Run gradle clean test with local plugin

Please Note: The example project is broken in many ways. I could not get
it working with neither 0.8.+ nor 0.9.0, neither gradle 1.9 nor 1.10.
The error is: http://pastebin.com/Q8iFDBGn. Did checked different
solutions, including android issue reports.
Add unit tests and fix issues found
Minor fix of naming and example project
Remove 0.8.x support and unit test. Move as fast as google android gradle 0.9.x