Added support for building project using gradle.#31

Open

farrukhnajmi wants to merge 3 commits intotyczj:masterfrom

farrukhnajmi:master

Commits on Apr 25, 2014

Added support for building project using gradle. Changes are backward compatible and still allow building using Eclipse and old style project structure
farrukhnajmi
committed

Commits on Apr 28, 2014

Changes to allow extending CalendarAdapter by clients
farrukhnajmi
committed
Merge pull request #1 from farrukhnajmi/custom-calendar-adapter
farrukhnajmi
committed