Initial commit
basic implementation of RobolectricTests suite mixin
Update to Robolectric 2.3
Add support for BeforeAndAfterAll mixin.

All tests in one RobolectricSuite will be executed in single robolectric environment, no state will be automatically reset between tests. This should give more flexibility and better performance, for example one database can be setup in beforeAll and used in all other tests.
Support selecting instrumented classes in RobolectricSuite subclasses