Update to gradle 1.12 and update build tools [build]
Null protect onScroll logic

- Add check to onScroll in DragSortController in response to instances seen when these events were null.
Remove unnecessary conditional check.
Update README.md
Add name/version and missing dependency [build]
Merge pull request #2 from loeschg/master

Update to gradle 1.12 and update build tools [build]