Add icons for better tracking
Add base64 icon strings
More icon savings
v0.4.1
Fix pluralization in FF fallback
Name should be lowercase
v0.4.2
Further reduce GitHub and Twitter icons

Thanks @andyshinn
https://github.com/HubSpot/signet/pull/7#issuecomment-27918381
v0.4.3
Merge branch 'master' into gh-pages