Revert "Remove `haml-rails` gem"
Revert "Remove `haml-rails` gem"

This reverts commit 59897ba8d8d04b6ad05769c172095b305f9a003f.

droptheplot/apipony,noidedmedia/apipony,droptheplot/apipony,droptheplot/apipony,noidedmedia/apipony,noidedmedia/apipony