Make date fields optional
Move from single main queue context to a "root" private queue context with a "child" main queue context. These contexts communicate with each other to share changes.
Unregister observers when tearing down contexts.
Merge pull request #8 from soffes/multiple-contexts

Multiple contexts
Add helper for resolving a permanent object id
Fix mixed up observers
Move source files into folder. That was getting out of hand
Adjust multiple-context implementation to more closely reflect the implementation of `UIManagedDocument`.

- No longer attempt to merge changes from root down into children
- Pull changes from *all* direct descendants of root into root
Adding Podspec file
removing git tag
adding commit
changing repo
Merge pull request #9 from rdougan/podspec

Adding Podspec
Merge branch 'master' of git://github.com/soffes/ssdatakit
Move SSManagedCollectionViewController into the SSDataKit folder
Adding iOS6 detection for SSManagedCollectionViewController