Minor release v2.0.2

- Fix radius for shadow in case, when images more then fifth

Minor release v2.0.1

- CollageView API is more simple to use, fields became non required, methods became open;
- Some code cleanup;

v2.0.0

prepare to release

v1.0.0-alpha: Merge pull request #5 from GrishinSergey/dev

added gradle wrapper bin files for Jitpack