feat(client): add landing page

new landing page
- add landing page to client with option to switch room or join current
- room is shown on navigation
- initial cleanup of navigation

upgrade libraries
- upgrade AngularJS to version 1.2
- upgrade Bootstrap to 3.0.0
- remove bootstrap javascripts in favor of ui-bootstrap (angular-ui)
- upgrade css to work with new libs

Closes #15, #16