Set attachmentVerticesCount to zero.
Fixed IK constraint bend direction keys.
Changed how scale is applied.

Scale is now multiplicative, as it was intended to be.
http://esotericsoftware.com/forum/viewtopic.php?p=16259#p16259
This change means skeletons need to be exported again using Spine 2.0.00+.
Variable naming, "previous" rather than "last".