derive avatar url from email

close #11
sort keys in db.json

+ friendly comments on the top of that file

ref https://github.com/repo-utils/badgeboard/issues/10
added footer with the link to this repo

ref https://github.com/repo-utils/badgeboard/issues/7
add moar padding to the footer
place org name instead of jshttp logo

ref https://github.com/repo-utils/badgeboard/issues/18
add table sorting

close https://github.com/repo-utils/badgeboard/issues/13
Merge git://github.com/repo-utils/badgeboard

Conflicts:
	config.yaml