Add UnnecessaryParentReference linter

Add linter which checks for uses of the parent selector reference (&)
that are unnecessary.

Change-Id: Ic720dc6f45c0d65715b2185f340f893e5d721475
Reviewed-on: http://gerrit.causes.com/40967
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>