allow requiring one property if another property is set

[Greg Druck]

i.e. {:required? [:when "content_id" some?]}

[Jonathan Leonard]

@gdruck this one was finished a while back yes? is there anything more to be done for it?

[Greg Druck]

the syntax suggested above doesn't work, but I don't remember if we decided to do it another way ...

[Jonathan Leonard]

@gdruck you'll need to update to 1.3.1 when you want to use this feature.