Adding GSAP 1.11.2

- Added new "lockAxis" feature to Draggable that [optionally] automatically locks dragging to either the horizontal or vertical axis (depending on the direction that the user begins dragging)

- Improved IE11 compatibility with Draggable (previously clicks/touches were intermittently ignored in IE11 only).

- Fixes regression that prevented the core ticker from powering down after no tweens are active (just to save some CPU cycles).

- Fixed issue that could cause a percentage-based css tween to measure as if the target is absolutely positioned even if it's not.

- Worked around a bug in the Firefox browser related to animating a 32-bit PNG from a scale of 0 in which case the transparent areas got rendered as black on the Mac.

- Worked around a bug in the Firefox browser that caused thin broken black borders on elements whose transform had a perspective applied but no other 3D-related transforms like z, rotationX, or rotationY.

- Fixed an issue that could cause a backgroundPosition css tween not to render its initial position correctly in Firefox.