Avoid Sass compiler error when extending .radius
Avoid Sass compiler error when extending .radius

Fixes #537.

Versions of Sass greater than 3.2.19 would raise an exception
(via Django pipeline) when attempting to @extend the .radius
selector from Foundation.

@include-ing Foundation’s radius() mixin seems to work instead.

mysociety/yournextmp-popit,neavouli/yournextrepresentative,mysociety/yournextrepresentative,neavouli/yournextrepresentative,DemocracyClub/yournextrepresentative,mysociety/yournextmp-popit,neavouli/yournextrepresentative,mysociety/yournextrepresentative,mysociety/yournextrepresentative,DemocracyClub/yournextrepresentative,mysociety/yournextrepresentative,neavouli/yournextrepresentative,mysociety/yournextmp-popit,mysociety/yournextrepresentative,DemocracyClub/yournextrepresentative,neavouli/yournextrepresentative,mysociety/yournextmp-popit,mysociety/yournextmp-popit