Retina favicons, #270
retina favicons
Added favicon tags
Added favicon tags
Added favicon tags
Added favicon tags
Added sizes attribute
Added sizes attribute
Added sizes attribute
Added sizes attribute
Fixes bounty #324 - strengthen comment li selector specificity.
Remove nested p tags in comments.

Caused by nesting markdown inside p tag. See
https://assembly.com/coderwall/wips/324#comment-3.
Fix #307 - provide protip live preview.
Fix #288 - add provider user lookup.

- Add controller to pick up /providers/:provider/:username.
- Add service to look up user by provider.
Bumped gem
WIP#374 Handle unsubscribe requests and piggy-back off the old Weekly Digest settings
Updated New Relic t-shirt image
Adding eager loading of Protip search results to minimize the number of sql queries during page rendering
Update README.md
Updated the Vagrant bootstrap to be entirely self-contained. The new box image is ready to run from the word 'up'.