Add spacing utilities.
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.
Merge branch 'infrastructure' into utils-spacing
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.
Improve comments and make formatting consistent with scss-lint standards.
Add tests for spacing utils.
Always use division instead of multiplying by decimal fractions.
Merge pull request #10 from mobify/utils-spacing

Add spacing utilities with tests.
Merge pull request #6 from mobify/utils-layout

Add layout utilities with tests.