TrelloAPI:
==========
* Removed TCommonException class.
* Replaced TOAuthClient with the new TrelloAPI
* Added TStack class like std::stack.
* Removed login button from MainMenu.xib
* TConstants: added TrelloForMacErrorCodes and TrelloForMacErrorDomain
* TConstants: changed const NSString's to defines
* Updated TAppDelegate to use the new TrelloAPI class instead of TOAuthClient
* TrelloAPI: use #connect for a connection with a new token request.
* TrelloAPI: use #connectWithToken for a connection with an old token. The token will be validated for expiration and updated if necessary
* TrelloAPI: use #getLastError to receive the last NSError posted by the api
* TrelloAPI: observe 'ConnectionError' | 'ConnectionSuccessful' NSNotifications to receive information about the connection status.