update project schema
Merge branch 'master' of github.com:holyman2k/WXKit

* 'master' of github.com:holyman2k/WXKit:
  clean up database save
  conflict resolution
  save context use overwrite
  add some core data work
  fix delete object in context
  bug fix on NSManagedObject
  added managed object
  improve class naming convention
  added category for UIImageView