Add an arbitrary number of breakpoints to your design

Signed-off-by: Luca Degasperi <me@lucadegasperi.com>
Moar mixins and semplification

Signed-off-by: Luca Degasperi <me@lucadegasperi.com>
Converted tabs to spaces

Signed-off-by: Luca Degasperi <me@lucadegasperi.com>
Merge pull request #1 from lucadegasperi/dynamic-breakpoints

Dynamic breakpoints