Project cleanup

Okay, so let's start with simple stuff - cleanup. Things i've done in this PR:

1. Used Objective-C modules, fix miscellaneous warnings for type conversion.
2. Merged EasyMappingExample and EasyMappingCoreDataExample projects into one. Tests are also moved from CoreDataExample project to Example project.
3. EasyMappingCoreDataExample project removed with all duplicated files(fixtures,etc.)
4. ManagedObject subclasses renamed, for example Car -> ManagedCar.

No functional or API changes for now. 

BTW, it would be nice to hook up Travis CI for automatic builds =) I can provide configuration files for that if you like =) 
/cc @lucasmedeirosleite