apotonick/hooks — pull request #11 by fredwu (2013-05-21 04:59:18+00:00)
Title: Halts the callbacks chain if a callback is falsey

See https://github.com/apotonick/hooks/issues/10

`run_hook_for` has to return a boolean so that callbacks can be aggregated like [this](https://github.com/fredwu/datamappify/blob/29cb509ef2cbf1e8e77cac75f702d2a1e2411fae/lib/datamappify/repository/query_method/callbacks.rb#L55-L68):

```ruby
# @param types [Array