Add layout utilities with tests.
Make u-bfc overflow test visible in older WebKit browsers.
Merge branch 'infrastructure' into utils-layout
Remove u-bfc-noclip, since it breaks when contents become wider than the container’s computed width, and may have issues in legacy Android.
Update pseudo elements to use double colons

The modern pseudo element selector uses two colons... `::before` and `::after`
Use Spline’s clearfix mixin for the clearfix class.
Merge branch 'utils-layout' of github.com:mobify/stencil into utils-layout

Conflicts:
	dist/utils/_utils-layout.scss
Update the utils-layout test to use the updated clearfix classname (.u-clearfix)
Rename .u-pc, .u-bfc to .u-position-context and .u-block-context
Fix the SCSS formatting to comply with out SCSS-Lint standard

Replaced all two space indentations with 4 space indentations.
Remove obsolete tests

.u-bfc-noclip was removed because it was not reliable (too fragile), given it's purpose.
Update the tests to reflect that u-pc and u-bcc classnames were changed
Avoid importing Sass mixins; handle errors instead.
Merge pull request #6 from mobify/utils-layout

Add layout utilities with tests.