Cleanup inline-block mixin check

  * Change double quotes to singles
  * Remove Law of Demeter violation
  * Reword spec description
  * Add a changelog entry

Change-Id: If5527ca8819fd0985f9db001f9c70dbffa819b1a
Reviewed-on: http://gerrit.causes.com/37270
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>