MPS Psi: getType never retuns null, It returns a fallback type
MPS Psi: class rename refactoring sort of works. PsiChangesWatcher switched to synchronous event handling for now
fast find usages for binary persistence
Merge branch 'danya'

Conflicts:
	IdeaPlugin/solutions/jetbrains.mps.idea.java.psiStubs/models/jetbrains/mps/idea/java/psiStubs.mps
Resolve conflicts and re-gerenaration