Add spec for MergeableSelector fix
Add spec for MergeableSelector fix

Change-Id: Id3930fdaeeb799713b95f4e0b962bf4426f0c4e6
Reviewed-on: http://gerrit.causes.com/38075
Tested-by: jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@causes.com>
Reviewed-by: Shane da Silva <6f6e68d1df92f30cb4b3ce35260ddf94a402f33d@causes.com>

artemartemov/scss-lint-hdm