Reimplemented gulp-ruby-sass

@extends are not working properly in gulp-sass
Merge branch 'wip'
Moved function import before config_site

Otherwise the $black-xx variables wouldn’t work.
Merge branch 'master' into wip
Added h6 selector to _text module
Merge branch 'master' into wip
Added empty placeholder folder

I added a .keep file inside to make sure Github allows these folders
Merge branch 'master' into wip
Added fix that prevents the sass watch from crashing after a syntax error
Merge branch 'wip'
Added minimal-ui value to viewport tag

As found through this article
http://visuellegedanken.de/2014-03-13/viewport-meta-tag-minimal-ui/
Improvements

Cleaned up, fixed hinting, more efficient script structure, removed IE
Support
Fixed lint-errors
Disabled image optimization due to it not working
Merge branch 'wip'

Conflicts:
	gulpfile.js
Removed IE code, cleaned up test code
Merge branch 'wip'
Merge branch 'master' into website

Conflicts:
	app/js/script.js