remove unneeded files
updated SPRITEKITPROJECTNAME to link with SK lib
added SpriteBuilder+SK submodule
PluginManager: added warning for missing icon file
BuildDistribution script: split off project generation (separate script), can run from any directory, reduced output to a minimum (errors, success or fail messages)
generate project script: added echo
SB project: added Run Script build phase where devs can uncomment lines in order to generate (update) the Xcode template projects on every build
build distribution cleanup, improved logging (avoid "rm: file does not exist")
SPRITEKITPROJECTNAME build fixes
Generate projects script excludes /tests/ folder(s)
Merge pull request #272 from KoboldKit/ccscheduler

SB+SK template project & build scripts
Updates submodules and fixes issue with retina displays
Merge branch 'develop' of https://github.com/apportable/SpriteBuilder into chipmunk

Conflicts:
	SpriteBuilder/SpriteBuilder.xcodeproj/project.pbxproj