ryanb/cancan — pull request #749 by mikepack (2012-09-26 07:13:29+00:00)
Title: Default subjects to :all when action is provided

This adds support for:

```ruby
can :do_something
```

Which is equivalent to:

```ruby
can :do_something, :all
```

Providing an action but no subjects will currently fail silently when invoked and throw an AccessDenied exception in the controller for non-resourceful actions. Fixes #734.