rosie.ws_client: store password in gnomekeyring

Prompt username and password with `zenity` or `raw_input` and `getpass`.
Introduce `rosie hello` for users to set up connection.
rosa-rpmbuild: install wrapper and bash completion
Merge branch 'master' into rosie-keyring
rosie.ws_client_auth: use icon for zenity
rosie.ws_client_auth: now pep8 friendly
rosie.ws_client_auth: don't die with no DISPLAY

Catch `RuntimeError` from `import gtk`.
Merge pull request #1283 from matthewrmshin/rosie-keyring

rosie.ws_client: store password in gnomekeyring