Adds build gruntfile
Merge branch 'css' of github.com:Semantic-Org/Semantic-UI into css

Conflicts:
	Gruntfile.js
	build/minified/elements/button.min.css
	build/minified/elements/header.min.css
	build/minified/elements/icon.min.css
	build/packaged/css/semantic.css
	build/packaged/css/semantic.min.css
	build/uncompressed/elements/button.css
	build/uncompressed/elements/header.css
	build/uncompressed/elements/icon.css
	build/uncompressed/elements/image.css
	build/uncompressed/elements/segment.css
	rtl/less/elements/button.less
	rtl/less/elements/header.less
	rtl/less/elements/icon.less
	rtl/less/elements/image.less
	rtl/less/elements/segment.less
	rtl/less/semantic.config
	rtl/less/themes/github/elements/button.overrides
	rtl/less/themes/github/elements/button.variables
	rtl/minified/elements/button.min.css
	rtl/minified/elements/header.min.css
	rtl/minified/elements/icon.min.css
	rtl/minified/themes/github/elements/button.overrides
	rtl/minified/themes/github/elements/button.variables
	rtl/packaged/css/semantic.css
	rtl/packaged/css/semantic.min.css
	rtl/packaged/themes/github/elements/button.overrides
	rtl/packaged/themes/github/elements/button.variables
	rtl/uncompressed/elements/button.css
	rtl/uncompressed/elements/icon.css
	rtl/uncompressed/themes/github/elements/button.overrides
	rtl/uncompressed/themes/github/elements/button.variables
	server/files/stylesheets/library/basic.icon.css