Make sure date gets returned as native Date object, not a string

It doesn't make sense to me to turn the date into a string as it must then be re-converted to a date for any other modifications/uses (for example, if you want to format it like 'January 1st, 2014' in the UI, but submit a timestamp or UTC string to the database).

It makes much more sense, to me at least, to keep it as a Date object and format that whenever needed using native functions or things like [the Angular date filter](https://docs.angularjs.org/api/ng/filter/date).