Added missing space
Updated button demo
Added .button-muted class
Fixed a typo
Changed $color-secondary variable to red
Updated some naming conventions
Changed button syntax from .button to .btn for brevity
Added $color-success, $color-danger, and $color-warning color variables
Updated button syntax to .btn for brevity
Updated button syntax to .btn for brevity
Updated color variables
Added color variables
Removed unused markup
Merge branch 'v3-sass-wip-4' into v3-base