Remove {skeleton|modernizr}-rails gems
[WIP] First version based on new mockups

- Cleanup old versions after deploy
- Added routes for categories
- Recipe list, refs #1 [2 rows, horizontally scrollable]
Merge branch 'master' into sprint-one

Conflicts:
	Gemfile.lock
Fix recipe list row splitting
Split rows exactly in half
Collapsable categories
Masonry-like recipe list view

- Added :wide and :tall Picture#photo styles
- Added tag color underneath the recipe box
- Close all recipe categories except first 3
- Added kitten image placeholder in recipe list view
Added Picture#photo_{width,height} properties

It's more reliable and less expensive than measuring geometry every time
Add Devise inviteable views
Added polish localization and set it as default language

- [WIP] Recipe list improvements
- [WIP] Lil' love for main menu and header
Updated dependencies

Added pry-rails gem
Removed localeapp gem