Adding GSAP 1.9.8

- Slightly enhanced 3D transform speed so that if you're only moving the element, translate3d() is used instead of matrix3d().

- Now transforms are remembered by default instead of always re-parsing the css data because some browsers incorrectly report that data in certain scenarios, causing odd behavior. Using the GSAP-recorded values is faster anyway. You may force re-parsing of the transform data by passing parseTransform:true in the vars object.

- Fixed issue that could prevent autoRotate from working on BezierPlugin tweens of DOM elements using top/left instead of x/y (only when no transforms had been applied previously to that element).

- Fixed issue that could cause a <select> DOM element to be interpreted as a selector, thus its children would be affected by the tween instead of the element itself.

- Fixed an issue that could cause kill() not to work when you define specific css-related properties for the kill() to affect without prefixing them with "css_".

- Fixed issue that could cause the "x" portion of backgroundPosition to be interpreted as 50% instead of 0 in a very rare scenario, mostly in Firefox.

- The virtual playhead of a TimelineLite and TimelineMax instance now adjusts backwards if necessary when children are removed. For example, if the timeline has completely played and then all children are removed, its virtual playhead will return to 0.

- Fixed issue that could cause all callbacks to be removed from a TimelineMax if null was passed to its removeCallback() method as the first parameter.

- Fixed issue in TimelineMax that could cause a problem if its pause() method is called from within its onRepeat.