cypriss/mutations — pull request #60 by polmiro (2014-03-03 23:03:00+00:00)
Title: Allow default values to be callable objects

It would be useful to be able to set callable objects when setting default values in mutations. One simple example:

```ruby
class UpdateCommand < Mutations::Command
optional do
date :updated_at, default: -> { Time.now }
end

def execute
...
end
end
```

Otherwise the Time.now would acquire the time the class was read during initialization.