Switch to kQOAuth

.. this removes the dependencies on liboauth and friends
   and replaces it with a single lib.

.. the library is available from http://github.com/kypeli/kQOAuth

.. the only current feature that requires OAuth is tweet
   your ride, but this lib will provide the services for
   future oauth services.
KQOAuth lib in src.pro

.. use -l and let the linker decide which lib to link in
   rather than specifying.