Add timestamp to device registrations. Needed for #11

Keep track of when device was registered so we can purge stale
registrations in the future.

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Add administration console custom page. Closes #12

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Deploy version 30 to GAE

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>