Moving documents url away from the Zip class

Zip/QuickZip.swift

@@ -40,6 +40,7 @@ extension Zip {
             throw ZipError.UnzipFail
         }
         let directoryName = fileName.stringByReplacingOccurrencesOfString(".\(fileExtension)", withString: "")
+        let documentsUrl = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0] as NSURL
         let destinationUrl = documentsUrl.URLByAppendingPathComponent(directoryName, isDirectory: true)
         try self.unzipFile(path, destination: destinationUrl, overwrite: true, password: nil, progress: progress)
         return destinationUrl
@@ -73,6 +74,7 @@ extension Zip {
     - returns: NSURL of the destination folder.
     */
     public func quickZipFiles(paths: [NSURL], fileName: String, progress: ((progress: Double) -> ())?) throws -> NSURL {
+        let documentsUrl = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0] as NSURL
         let destinationUrl = documentsUrl.URLByAppendingPathComponent("\(fileName).zip")
         try self.zipFiles(paths, zipFilePath: destinationUrl, password: nil, progress: progress)
         return destinationUrl

Zip/Zip.swift

@@ -31,9 +31,6 @@ public class Zip {
     // File manager
     let fileManager = NSFileManager.defaultManager()
     
-    // Documents folder
-    let documentsUrl = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0] as NSURL
-    
     // MARK: Lifecycle
     
     /**