Add CKContainer variable to config (#20)

Squashed commit of the following:
    Update version to 2.0.1
    Revert change: FetchAndSaveOperation.allDatabases
    Fix unit tests crash
    Add `container` variable to config

CloudCore.podspec

@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
   s.name             = "CloudCore"
   s.summary          = "Framework that enables synchronization between CloudKit (iCloud) and Core Data. Can be used as CloudKit caching mechanism."
-  s.version          = "2.0.0"
+  s.version          = "2.0.1"
   s.homepage         = "https://github.com/sorix/CloudCore"
   s.license          = 'MIT'
   s.author           = { "Vasily Ulianov" => "vasily@me.com" }

Source/Classes/CloudCore.swift

@@ -91,7 +91,7 @@ open class CloudCore {
 		#endif
 
 		// Fetch updated data (e.g. push notifications weren't received)
-		let updateFromCloudOperation = FetchAndSaveOperation(persistentContainer: container)
+        let updateFromCloudOperation = FetchAndSaveOperation(persistentContainer: container)
 		updateFromCloudOperation.errorBlock = {
 			self.delegate?.error(error: $0, module: .some(.fetchFromCloud))
 		}
@@ -153,7 +153,7 @@ open class CloudCore {
 		- completion: `FetchResult` enumeration with results of operation
 	*/
 	public static func fetchAndSave(to container: NSPersistentContainer, error: ErrorBlock?, completion: (() -> Void)?) {
-		let operation = FetchAndSaveOperation(persistentContainer: container)
+        let operation = FetchAndSaveOperation(persistentContainer: container)
 		operation.errorBlock = error
 		operation.completionBlock = completion
 
@@ -176,9 +176,9 @@ open class CloudCore {
 		guard let id = notification.subscriptionID else { return nil }
 
 		switch id {
-		case config.subscriptionIDForPrivateDB: return CKContainer.default().privateCloudDatabase
-		case config.subscriptionIDForSharedDB: return CKContainer.default().sharedCloudDatabase
-		case _ where id.hasPrefix(config.publicSubscriptionIDPrefix): return CKContainer.default().publicCloudDatabase
+		case config.subscriptionIDForPrivateDB: return config.container.privateCloudDatabase
+		case config.subscriptionIDForSharedDB: return config.container.sharedCloudDatabase
+		case _ where id.hasPrefix(config.publicSubscriptionIDPrefix): return config.container.publicCloudDatabase
 		default: return nil
 		}
 	}

Source/Classes/Fetch/FetchAndSaveOperation.swift

@@ -12,11 +12,11 @@ import CoreData
 /// An operation that fetches data from CloudKit and saves it to Core Data, you can use it without calling `CloudCore.fetchAndSave` methods if you application relies on `Operation`
 public class FetchAndSaveOperation: Operation {
 
-	/// Private cloud database
+	/// Private cloud database for the CKContainer specified by CloudCoreConfig
 	public static let allDatabases = [
-		//		CKContainer.default().publicCloudDatabase,
-		CKContainer.default().privateCloudDatabase,
-//		CKContainer.default().sharedCloudDatabase
+//		CloudCore.config.container.publicCloudDatabase,
+		CloudCore.config.container.privateCloudDatabase
+//		CloudCore.config.container.sharedCloudDatabase
 	]
 
 	public typealias NotificationUserInfo = [AnyHashable : Any]

Source/Classes/Save/ObjectToRecord/ObjectToRecordConverter.swift

@@ -120,7 +120,7 @@ class ObjectToRecordConverter {
 
 	/// Get appropriate database for modify operations
 	private func database(for recordID: CKRecordID, serviceAttributes: ServiceAttributeNames) -> CKDatabase {
-		let container = CKContainer.default()
+		let container = CloudCore.config.container
 
 		if serviceAttributes.isPublic { return container.publicCloudDatabase }
 

Source/Classes/Setup Operation/CreateCloudCoreZoneOperation.swift

@@ -27,7 +27,7 @@ class CreateCloudCoreZoneOperation: AsynchronousOperation {
 			self.state = .finished
 		}
 
-		CKContainer.default().privateCloudDatabase.add(recordZoneOperation)
+		CloudCore.config.container.privateCloudDatabase.add(recordZoneOperation)
 		self.createZoneOperation = recordZoneOperation
 	}
 

Source/Classes/Setup Operation/SubscribeOperation.swift

@@ -20,7 +20,7 @@ class SubscribeOperation: AsynchronousOperation {
 	override func main() {
 		super.main()
 
-		let container = CKContainer.default()
+		let container = CloudCore.config.container
 
 		// Subscribe operation
 		let subcribeToPrivate = self.makeRecordZoneSubscriptionOperation(for: container.privateCloudDatabase, id: CloudCore.config.subscriptionIDForPrivateDB)

Source/Model/CloudCoreConfig.swift

@@ -27,6 +27,13 @@ public struct CloudCoreConfig {
 
 	// MARK: CloudKit
 
+    /// The CKContainer to store CoreData. Set this to a custom container to
+    /// support sharing data between multiple apps in an App Group (e.g. iOS and macOS).
+    ///
+    /// Default value is `CKContainer.default()`
+	// `lazy` is set to eliminate crashes during unit-tests
+    public lazy var container = CKContainer.default()
+
 	/// RecordZone inside private database to store CoreData.
 	///
 	/// Default value is `CloudCore`