Refactors ink-labels
Gutters are now based in the same @gutter-width constant
Adds pusher classes to utilities.less
Added showcase class for creating a new area of the HP to show off sites made with Ink.

Signed-off-by: Pedro Couto e Santos <psantos@co.sapo.pt>
Adds clearfix mixin
Replaces some CSS properties with the respective mixins.
Optimizes typography styles.
Adds labels configuration file.
Addresses topbar background bug in IE
Adds footer style and configuration files.
Replaces some CSS properties with the respective mixins; Removes text-shadow from the buttons disabled state.
Updates html templates.
Removes redundant footer styles.
Adds .small, .large, and .extralarge classes to typography.