fix From clauses not setting the NSFetchRequest's affectedStores property properly

CoreStore.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
     s.name = "CoreStore"
-    s.version = "1.6.9"
+    s.version = "1.6.10"
     s.license = "MIT"
     s.summary = "Unleashing the real power of Core Data with the elegance and safety of Swift"
     s.homepage = "https://github.com/JohnEstropia/CoreStore"

CoreStore/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.6.9</string>
+	<string>1.6.10</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>

CoreStore/Internal/CoreStoreFetchRequest.swift

@@ -33,11 +33,10 @@ import CoreData
 // http://stackoverflow.com/questions/14396375/nsfetchedresultscontroller-crashes-in-ios-6-if-affectedstores-is-specified
 internal final class CoreStoreFetchRequest: NSFetchRequest {
     
+    @objc
     override var affectedStores: [NSPersistentStore]? {
         
-        get { return self.safeAffectedStores }
-        set { self.safeAffectedStores = newValue }
+        get { return super.affectedStores }
+        set { super.affectedStores = newValue }
     }
-    
-    private var safeAffectedStores: [NSPersistentStore]?
 }