Sanitize API, add documentation, update demo app
Update README.md
Remove unused class
Update Podspec
Merge branch 'master' of github.com:vpdn/MMLayershots
Add spinner while psd is created
Merge branch 'master' of github.com:vpdn/MMLayershots
Merge branch 'master' into landscape-mode

Conflicts:
	MMLayershots/MMLayershots.m