Update README.md
Added instructions for OS X to the README.
Update README.md
Update README.md
Changed the info included in the did-save-merge-changes delegate and notification methods to use the NSManagedObjects from the save, rather than the object ids. This recent change to object ids broke conformance on iOS 6.
Remove reference to duplicate header files

The :submodules attribute causes the Dropbox SDK to be downloaded and the source_files references the header files. Meanwhile, the cocoapods dependency already downloads and includes the same header files (in a different location). The result is a duplicate symbol error.
Merge pull request #147 from dhennessy/master

Remove reference to duplicate header files
Merge branch 'master' of https://github.com/drewmccormack/ensembles