cleanup resizeCallbacks in application controller
bottom padding and max width for Share pane, et al
Ruby 1.9.3-p385 is now required
Gemfile: many Ruby Gem updates
update Sass mixing library bourbon to 3.1.0

http://bourbon.io

see change log here: https://github.com/thoughtbot/bourbon/wiki

- retina-image addon
- keyframes mixin
- Pixel to Ems addon
- placeholder mixin
- size addon
- triangle addon
- vendor prefix settings
remove use of deprecated @box-shadow mixin

box-shadow can be used directly in CSS now
removed references to non-existent components
lighten and add transparency to keyboard focus