[author] Updating GSAP to 1.11.8

- Enhanced AttrPlugin so that it can set non-numeric values.

- Worked around an issue in the new Firefox 29 that could cause the pivot point of a Draggable of type "rotation" to be miscalculated when the page has been scrolled.

- Fixed an issue that could cause the onThrowUpdateScope and onThrowUpdateParams not to work as expected in Draggable.

- Draggables of type "scroll | scrollTop | scrollLeft" will now kill scrollTo tweens onPress to avoid conflicts.

- When you disable() a Draggable, it no longer kills the tweens affecting it (now only kill() does that). This seemed more intuitive and flexible.

- TimelineMax's tweenTo() tweens will default to overwrite:"all" unless a delay is specified. This helps avoid rare problems with racing conditions when tweenTo() is called on the same timeline over and over again on each frame.

- Fixed problem with CSSPlugin not maintaining skewY on subsequent tweens of the same element.