rails/rails — pull request #5542 by mhfs (2012-03-21 22:48:42+00:00)
Title: Port of #5522 'Fix adding/removing field's index when generating migration'

This is just a port of #5522 to 3-2-stable with the minor fix from #5540 already applied.

Cheers!

/cc @josevalim @travisjeffery