don’t allow deletion of RMDirectory’s.
Merge branch 'develop' of https://github.com/spritebuilder/SpriteBuilder into develop
update Sprite Kit project & reader to v10
Merge branch 'develop' of https://github.com/spritebuilder/SpriteBuilder into develop
remove bad calls to pngquant and optipng for the benefit of apple submission.
Merge branch 'pngquant' into develop
Merge pull request #621 from jtwigg/develop

Apple submission fix.
Disables SpriteKit by default
Merge pull request #618 from KoboldKit/develop-steffen

update Sprite Kit project & reader to v10