         - returns: An access token if present, otherwise `nil`.
     */
     public func getAccessToken(user: String) -> DropboxAccessToken? {
-        if let accessToken = Keychain.get(user) {
+        if let accessToken = DBKeychain.get(user) {
             return DropboxAccessToken(accessToken: accessToken, uid: user)
         } else {
             return nil

    }
    
    class func clear() -> Bool {
        let query = Keychain.queryWithDict([:])
        return SecItemDelete(query) == noErr
    }
}

        - returns: whether the operation succeeded
    */
    public func clearStoredAccessTokens() -> Bool {
        return DBKeychain.clear()
    }
    /**
        Save an access token
