multiple actions for :on option with after_commit and after_rollback

[senny]

This is the feature requested in #988.

It simply adds the possibility to supply multiple actions for the :on parameter when defining after_commit and after_rollback callbacks.

after_commit :do_foo_bar, :on [:create, :update]
after_commit :do_bar_baz, :on [:update, :destroy]

[senny]

@rafaelfranca @carlosantoniodasilva could you take a look?

[steveklabnik]

Looks good to me, but I'm no AR master.

[steveklabnik]

Checked it out again, read it closely, seems good. :D

[sikachu]

Would you mind submit a guide update for this? Thanks!

[sikachu]

(Oh, and that could go to docrails if you want to get it merged fast.)

[senny]

@sikachu I'll update the guides.

[rafaelfranca]

Was the guides updated?

[senny]

@rafaelfranca not yet. It's on my todo list