Upgrade dependencies
Use rails-autoprefixer

So we don't need to specify vendor prefixes and we can get rid of all
of our current mixins.
Minor improvements in Guardfile
Use recommended bootstrap-sass configuration
Extract sass variables to a separate file
Remove unnecessary extensions
Upgrade dependencies
Remove all_on_start guard option

It takes long...
Use recommended comment style in scss
Optimize Nipa Nipa for mobile
Whitespace
Definitely more correct and standard
Accessibility