Merge branch 'develop' into corestore4_develop

# Conflicts:
#	CoreStore.podspec
#	Sources/CoreStoreImportableAttributeType.swift
#	Sources/CoreStoreQueryableAttributeType.swift
#	Sources/Info.plist
#	Sources/NSManagedObjectModel+Setup.swift

Sources/VersionLock.swift

@@ -0,0 +1,89 @@
+//
+//  VersionLock.swift
+//  CoreStore
+//
+//  Copyright © 2017 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+import Foundation
+
+
+// MARK: - VersionLock
+
+public struct VersionLock: ExpressibleByDictionaryLiteral, Equatable {
+    
+    public typealias HashElement = UInt64
+    
+    public let hashesByEntityName: [EntityName: Data]
+    
+    public init(_ intArrayByEntityName: [EntityName: [HashElement]]) {
+        
+        self.init(keyValues: intArrayByEntityName.map({ $0 }))
+    }
+    
+    
+    // MARK: ExpressibleByDictionaryLiteral
+    
+    public typealias Key = EntityName
+    public typealias Value = [HashElement]
+    
+    public init(dictionaryLiteral elements: (EntityName, [HashElement])...) {
+        
+        self.init(keyValues: elements)
+    }
+    
+    
+    // MARK: Equatable
+    
+    public static func == (lhs: VersionLock, rhs: VersionLock) -> Bool {
+        
+        return lhs.hashesByEntityName == rhs.hashesByEntityName
+    }
+    
+    
+    // MARK: Internal
+    
+    internal init(entityVersionHashesByName: [String: Data]) {
+        
+        self.hashesByEntityName = entityVersionHashesByName
+    }
+    
+    
+    // MARK: Private
+    
+    private init(keyValues: [(EntityName, [HashElement])]) {
+        
+        var hashesByEntityName: [EntityName: Data] = [:]
+        for (entityName, intArray) in keyValues {
+            
+            hashesByEntityName[entityName] = Data(
+                buffer: UnsafeBufferPointer(
+                    start: intArray,
+                    count: intArray.count
+                )
+            )
+        }
+        self.hashesByEntityName = hashesByEntityName
+    }
+}
+
+
+