Add Core Data goodness

Allows you to include a context so you can deal with core data models more easily.

Also removes the custom key path stuff added in v0.9.4 since it adversely affected performance.

v0.9.4

Merge pull request #49 from utahiosmac/performance

Use `valueForKeyPath` on NSDictionary for better performance.

Now with more protocols!

Protcols, protocols eveywhere.

1 patch closer...

Merge pull request #42 from utahiosmac/cocoapods

Add initial podspec.