Merge pull request #57 from moitias/luaanimationfixes

Fix a few Lua animation problems
Compute scale using sprite collection's target ortho size. Removed scale from skeletondata asset.
Merge remote-tracking branch 'origin/master'
Fixed issue #58
Fixed AS3 colors.
Some small optimizations.
Fixed attachAll.
Added getAnimationState.
Added mesh.MarkDynamic().
Minor updates.
Updated goblins atlas to have rotation.
Fixed getFrameCount for attachment timelines, issue #62
Fixed CCSkeletonAnimation.

Oops!
Update Util.cs

RenderTarget2D is volatile. This means when there is any change to screen resolution, the content will be lost. This is common when changing to full-screen, alt+tab, screensavers, and locking/unlocking the computer. We can counteract this by directly setting the content of Texture2D.
Update Util.cs

Remove unneeded casts.
Merge pull request #63 from BigRedPK/master

XNA RenderTarget2D Fix
Changed to Color32. Reduced zeroing mesh verts.
Merge remote-tracking branch 'origin/master'
remove findslot from skeleton and make it into a table, for faster lookups
remove findslotindex from skeletondata and make it into a table, for faster lookups