Merge pull request #14 from staltz/master

Added license (CC BY 4.0)
Added Robolectric support

Project now supports Robolectric testing that
is performed on the local machine. No need
for Android device nor emulator.

Added some tests as examples

To run the tests start gradle's 'test' task
Retrojava → Retrolambda
Update README.md
Merge pull request #18 from brenopolanski/patch-1

Update README.md
Merge pull request #17 from passy/patch-1

Retrojava → Retrolambda
Merge pull request #16 from jaggernod/feature/introduce-robolectric

Added Robolectric support
Merge pull request #19 from staltz/master

Added contributing guidelines
Merge pull request #20 from staltz/master

Added designtime advice #11
Added link to iOS Good practices