support Time objects

[Milovan Zogovic]

Changing following line:
https://github.com/cypriss/mutations/blob/master/lib/mutations/date_filter.rb#L20

to:
if data.is_a?(Date) || data.is_a?(Time)

Would support both Date, DateTime and Time objects. I'm dealing with TimeWithZone instances in my rails project and this would come in handy. Up until then, I could use the following:

duck :starts_at, methods: [:acts_like_time?]

[openface]

I'm surprised that there is no support for timestamps as inputs. We're having to write our own filter here to support timestamps in our application.

[Lorcan Coyle]

I've added a PR that would support time objects: #90

[Eugene Kenny]

#90 was released in 0.8.0! 🎉