First pass at dividing into subspecs.
Separated out NSManagedObject category into subspec.
Fixed incorrect path.
Use local pod for sample project.
Easier to test changes to podspec this way.
Split NSOperation subclass into subspec.
Tableview subclass needs UIKit, added to frameworks.
Renamed 'Core' to 'ContextManager', corrected header path.
Updated example project podfile.
Merge pull request #13 from 3squared/feature/subspecs

Split podspec into sub specs