Removes PIE Support

CSS3PIE was removed in Compass 1.0 and has been removed here.
Adds Breakpoint requirement for imports
Updates toolkit clearfix & integration

Updates to use toolkit's clearfix mixin instead of custom defined mixin
and updates toolkit integration.
Removes Singularity

SUSY preference means no need for singularity.
Removes Singularity from WYSIWYG css

For got to remove Singularity in cosmic.wysiwyg.scss.
Converts breakpoint variables to a SASS map.

Now uses one Sass map instead of separate variables for each breakpoint.
Also fixes config.rb to swap around environment output styles, re-enable
line comments for dev environment and disables debugging info.
Converts cosmic.layout to SUSY 2 completely

Adapted all styles within to SUSY 2. Also changed breakpoints map name
to be a little shorter.