Call saveUndoState when inspector block selector is changed. (mark document as dirty)
Merge pull request #260 from pierrepaullavoie/upstream-257

Call saveUndoState when inspector block selector is changed.
Created CCSpriteBatchNode plugin, added support for texture atlas properties, added pvr and pvr.ccz as supported images.
Second commit, for support of CCSpriteBatchNode
Applied patch for CCSpriteBatchNode support
Merged CCSpriteBatchNode files to develop branch