Added navbar and masthead for event page.

Start using bootstrap to beautify flock-registration pages.
Added navbar and masthead for event page.

Start using bootstrap to beautify flock-registration pages.
Remove gap between navbar and masthead.
Left align 'Pre-registration' text in masthead.
Merge pull request #27 from rtnpro/flock-bootstrap

Added navbar and masthead for event page.
 Use flask_openid safe_roots for Covert Redirect.
Merge branch 'master' into develop
Add a simple /admin/rejected view
Use find instead of find_one
Link to the admin view from the list of proposals
Simplify admin check