Changing to new authentication mechanism ongoing

Changing to new authentication mechanism ongoing

 - disabled old FB authentication mechanism

 - changed login url & changed from parsing the access token to
   parsing the whole session

 - Interface for sending requests to Situare server. Appends
   parameters and session information. Enqueues requests if
   session information is not available.

 - sorting SituareService.cpp

 - fetching locations is currently only one using the new interface