Renamed basic stack tests and deleted test bridging header (unneeded)
Added core data stack synchronous save
Added simple fetch to stack - failing fetches crash due to a bug (18758362)
Added CoreData model source enumeration
Added core data store parameters enumeration
Removed rogue commented code from test
Added core data stack configuration
Added main bundle merge to core data model source
Added model creation from model source
Changed default model source to main bundle merge in stack configuration
Added all bundles model source
Added failing model creation tests
Added associated value methods to store parameters enum
Added persistent store coordinator creation
Changed default context concurrency type to private queue
Extracted utility functions into a helpers file
Updated stack creation