refactor some internal methods. renamed addInMemoryStore to addInMemoryStoreAndWait to reflect synchronicity.

CoreStore/Internal/NSFileManager+Setup.swift

@@ -0,0 +1,38 @@
+//
+//  NSFileManager+Setup.swift
+//  CoreStore
+//
+//  Created by John Rommel Estropia on 2015/07/19.
+//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//
+
+import Foundation
+
+
+// MARK: - NSFileManager
+
+internal extension NSFileManager {
+    
+    // MARK: Internal
+    
+    internal func removeSQLiteStoreAtURL(fileURL: NSURL) {
+        
+        do {
+            
+            try self.removeItemAtURL(fileURL)
+        }
+        catch _ { }
+        
+        do {
+            
+            try self.removeItemAtPath(fileURL.path!.stringByAppendingString("-shm"))
+        }
+        catch _ { }
+        
+        do {
+            
+            try self.removeItemAtPath(fileURL.path!.stringByAppendingString("-wal"))
+        }
+        catch _ { }
+    }
+}