Implement single-target inertia
Add interact and Interactable inertia methods
demo/snap: enable inertia
Update Docs
Prevent inertia related errors on gestureend
Merge branch 'master' into inertia

Conflicts:
    interact.js
Improve inertia decay and fire inertiastart events
Implement quadratic bezier inertia end snapping
Prepare for smooth inertia endOnly restrictions
Merge branch 'master' into inertia
Implement smooth restrict endOnly during inertia
demo/snap: add a basic demonstration of inertia
Fix inertia in browser that support GestureEvents

Native inertiastart is stopped.
Modify snap demo to work in IE9
Don't using native event timestamp object
Merge branch 'master' into inertia
Make inertia more stable
Allow the user to regain control during inertia

If the event target is the inertia target element and the resulting
action of the event is the same as the current inertia action then
inertia is stopped and the event sequence continues as normal.
Merge branch 'master' into inertia

Conflicts:
	interact.js
Remove incorrect inertiastart targetXY props