Add PropertyWithMixin Compass linter

Add the first Compass-specific linter, `PropertyWithMixin` which checks
for properties which have corresponding Compass mixins whose use is
preferred over the property.

Change-Id: I967bf51a748d543e45c38762d7342c34529b0155
Reviewed-on: https://gerrit.causes.com/30810
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Hao Su <hao.su@causes.com>