Add basic support for Pointer Events

Multiple pointers aren't working properly yet.
Handle multiple simultaneous pointers
Merge branch 'pointer' of https://github.com/lluchs/draggabilly into pointer
refactor pointer logic

+ add postStartEvents hash
+ test for standard PointerEvents for IE11 first
+ tick version 1.1.0

Ref #25
refactor, add containDrag
Merge pull request #1 from desandro/master

Rebase