1.31

• [NEW] Swift 3 support. (Goncharov Vladimir, Hardik, rentzsch)
• [CHANGE] Add nullability to the primitive value. (Tom Carey)
• [CHANGE] Allow for nullable collection properties. (Ibrahim Sha'ath)
• [CHANGE] Mark +entityInManagedObjectContext: nullable. (Ibrahim Sha'ath)
• [DOC] Update link to Apple's Core Data Programming Guide. (Brian Schrader)
• [FIX] Syntax error in Objective-C templates. (Dave Wood)
• [TEST] Add Parent.orderedChildren ordered relationship. (rentzsch)