Enforce some linting
Enforce some linting

People keep commiting unused imports, which are
the easiest to check, so create some noise if they
do that.

lrytz/scala,martijnhoekstra/scala,lrytz/scala,martijnhoekstra/scala,lrytz/scala,martijnhoekstra/scala,scala/scala,martijnhoekstra/scala,lrytz/scala,martijnhoekstra/scala,lrytz/scala,scala/scala,lrytz/scala,scala/scala,martijnhoekstra/scala,scala/scala,scala/scala,scala/scala