Added GCDAsyncSocket & tor control port commands and response parsing

[davidchiles]

Added GCDAsyncSocket as method for connecting to socket instead of custom socket setup.

More info on the TOR control port commands.

Commands

• CPAProxyCommand - Object that contains the actual command string and response block that should be called. When a command is sent to the CPASocketManager the string is sent over the control port and then queued waiting for a response from TOR (normally 250 OK). Once the response is received the command is removed from the queue and sent into the delegate via - (void)socketManager:(CPASocketManager *)manager didReceiveResponse:(NSString *)response forCommand:(CPAProxyCommand *)command;. If there is not a queued command or the response is asynchronous the method is called on the delegate but command is nil.

  Response

• CPAProxyResponseParser - This class is just a way to organize all the specific parsing code to retrieve status codes and such. More methods should be added here as more responses are handled.
• CPASocketManager - There is now code to better handle asynchronous responses (status code 650). This includes multi line responses ending in '.' and connecting a given response to the command that initiated it.

[chrisballinger]

testSuccessfulProxySetup encountered an error (Test process crashed)

Hmmmm, looks like I need to modify the .travis.yml/xcpretty script to actually output the test results. Maybe it's calling a method that doesn't exist anymore or something? What happens when you run the tests manually?