Choice comes to Kvasir!

Customization of the login page and use of the dddddddada daa da da AFRO
CIRCUS loading video have come to Kvasir.

If you want to use a different image for the login page, set it in your
kvasir.yaml file. Your image must exist under the static/ directory.

Some people love Afro Circus. Others have become tired of it. Now you
can point the loading video to something else! This must also reside
under the static/ directory. Comment out loading_video in your
kvasir.yaml file for a dull and boring progress animation bar. Actual
progress not shown.
Merge pull request #93 from grutz/image_choice

Customization comes to Kvasir! https://www.youtube.com/watch?v=_aELcXyjpts