header images
header flags
header ui and flags sprites
fonts montserrat
append background-image start

The idea here is to clearly separate the structure/styling:
By default, css-sprites requires us to add a class to the element(s), to apply the corresponding background-image.
What we want is a complete stylus mixin: just calling sprite(spriteName) will also apply background-image.
append remove flags for debugging purposes
header fixes
- sprites fix the path to the images
- update layout
- global tweaks
- require ui sprites
- update colors
header polyfills
fonts import
sprite improvement moved to sprite task
sprite improvement clean and comment
Merge branch 'feature/fonts' into feature/header
IE8 compatibility

- no header tag
- no section tag
- no footer tag
sprites stop tracking
sprite improvement background size for retina fix
polyfills clear fix and border-radius
use the clearfix mixing, add new colors and update the ui spritesheet
header main css
clean, comment and moved back to brackets (for readability)
sprites renaming and responsive improvement (third breakpoint)