Modified Spine parser.
Now better control on attachements and animation skin attachments (visibility keyframing).
Fixed error for Drag threshold.
complete spine format support:
multi skin, multi animation files, visibility keyframes.
Multiple commints.
* 04/02/2013 0.6 Build 49 *
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* Added. Skeletal animation based on Spine (by @EsotericSoft) format.
* Added Demo34 to show its capabilites.
* 04/02/2013 0.6 Build 49 *
---------------------------

* Added. Skeletal animation based on Spine (by @EsotericSoft) format.
* Added Demo34 to show its capabilites.
Fixed some demos titles.
Added demo thumbnails.
* 04/07/2013 0.6 Build 52 *
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* Changed. Some functions from Matrix objects to Matrix class.
* Added. Modification to CAAT.Math.Rectangle . if no parameters in constructor is set to empty.
* Fixed. CAAT.Foundation.UI.Label dependencies.
* Fixed. CAAT.Foundation.Actor dependencies.
* Added. Capture skeletal animation on-the-fly to an spriteSheet.
When a CatMulRom only has 2 or 3 control points, duplicate the first and last points so  we can at least create a path