Merge pull request magicalpanda#1021 from magicalpanda/develop

Release MagicalRecord 2.3.0

Update Circle configuration to update submodules

Update podspec to 2.3.0-beta 5

Update podspec to 2.3.0-beta.4

Bump podspec to 2.3.0-beta.3

Disable deprecation warning inside the library

Disable deprecation warning inside the library

Prefix import functions with MR_ to avoid conflicts

Closes magicalpanda#722.

Fix for magicalpanda#387

Improved error handling

- Let’s handle an addPersistentStoreWithType:configuration:URL:options:error: error regardless of whether we want to delete the store on model mismatch.