CSD File Format Change

[psineur]

@andrew0, just copying your comment from #44 here, cause it is another issue.

@andrew0: "oh, and I also changed the way that the saving/loading works a bit... now it uses NSStringFromPoint(NSPointFromCGPoint(position_)) instead of separately doing posX and posY. I figured that I might as well do it now before someone probably has an actual project they're using with cocoshop."

I created a page in wiki about CSD file format, probably you should create page for file format in 0.2 (upcoming version that is currently in the develop branch)
https://github.com/andrew0/cocoshop/wiki

Also, like NSStringFromPoint, there's simillar functions for rectangles - probably you would like to use them too.

[psineur]

This can be labeled as for experimental-newGUI branch, but i'm gonna cherry-pick CSNode+CSSprite from there, so probably i will collide with this issue.