Add new splash page and make old app password protected.

Splash page is now default page. The user can enter an email address
for future consideration. Nothing is done with the email address as of
right now but it ends up in the welcome controller.

The search/new starting point is now protected by a password, right
now just hardcoded in as user and password.

Appropriate routing changes.
Add some bootstrap stylesheet stuff to repo.

Also add a background image for splash page. Forgot to do this in
previous commit.
Merge branch 'master' of https://github.com/friendography/prototype-lester