Function to handle notification from openbadger that a badge claim has been issued.

Very rough functional version.
Improvements to email template selection.
Removing duplicate error logging.
footer adjustments and logo links, font size increase (todo: move footer to template)
border-radius on nav to match filter
simplified logic to use default
Fixing `db` file path
added mentors link to footer. fixes #480
added organizations link to footer. fixes #479
modified sample claim code to match style of actual claim codes. fixes #496
changed My Playlist to Playlist in My CSOL dropdown. fixes #300
Merge branch 'master' of https://github.com/mozilla/CSOL-site
paragraph at bottom of page now has "lead" class. fixes #297
Move filter label options out of JS and into template.
consistent footer throughout, removed from .js
Merge remote-tracking branch 'origin/master'
footer height set
just tabs and spaces
added rubric to badge apply page prior to first form. fixes #508
added requirements to badge detail page. fixes #518