Angular timepicker

A rewrite of `js/ui/timepicker`.
Currently has all the functions of old timepicker, but we may want to drop/revise some. Cannot currently replace old timepicker, due to the non-angular nature of many sport admin pages that utilize timepicker.

QA on venue admin can be found [here](https://github.com/sportngin/venue_admin/pull/116)

~~In order to simulate blur events for tests, I needed to add jquery. I don't think there's a better way to simulate blur events, but there may be a better way to import jquery. I could also bypass the blur events and just test the function itself, if necessary/recommended.~~
Instead of simulating blur events, I just triggered them manually using the function called by ng-blur, because I didn't know if adding jquery was really a thing we wanted to do. Tell me and I can change it back.
Yeah, that would work better. I'll test that out, but I don't think it will work. If you'd like to take a look at the updated code, that would be great.

I didn't see your case-mixing comment before. The case mixing is somewhat intentional. I prefer camelCase for readability, but since the variables are passed in as html attributes, they have to be lowercase. Since I couldn't get `_.defaults` to work, I used lowercase on the scope and camelCase for opts. Should I just change both to lowercase? (I'll probably have to if I get defaults to work properly, but if I don't.....)