Merge pull request #4 from orta/master

@dblock => use cocoapods as epected by them there authors
Merge pull request #5 from orta/master

@dblock => allow specta extras, and a simpler image folder setting
Corrected snapshot method name.
Use a different implementation without a recorder.
Updated to match ios-snapshot-test-case HEAD.
Updated to the 1.1 release of ios-snapshot-test-case.
Added dependency on FBSnapshotTestCase.
Surface error from snapshot comparison and recording and mark tests that use recordSnapshot as failed. Closes #7 and #8.
Improved messaging.
provide a default for the reference images directory