Console light theme changes

icons should have line-height
mozilla specific font smoothing
add line-height in ems to small and tiny sizes
variablize large, small, tiny, extratiny

Tweak padding and sizing
Create +.btn [class*="icon-"] style to position icon exact vertical center

Remove default left offset from icon class rule
 - this was to add space btw icon and text, but it causes issues when icons used within .btn
 - will have to add &nbsp; or come up with another option

Alert borders weren't showing b/c no border style & width set. Fixed it.
- also simplified their color function to just darken

Introduced .table-no-borders class which is used on the domain members table

Fixed "delete" x button on members form