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.
I would use either '@' or '=' for the format.  (Use '=' if you foresee passing it by reference to be valuable.)

`@` invokation: `<timepicker display-format="fmt">` (no single quotes)
`=` invokation: `<timepicker display-format="'fmt'">` (single quotes)

Also, what about shortening it to `format`?