Add regular_schedules table.

Allows importing regular opening and closing times for a location
and/or service.

Valid values for the `weekday` field are:

- Integer or String between 0 and 6, where 0 means Sunday.

- String of full weekday name, such as “Monday”

- String of abbreviated 3-letter weekday name, such as “Tue”

Valid values for the `opens_at` and `closes_at` fields are:

- String representing hour in 24-hour format, such as “09:00” and
“17:00”. Note the leading zero is required.

- String using “am” and “pm”, such as “10am” and “5pm”.
Add admin support for location hours of operation.
Add admin support for service hours of operation.
Expose regular_schedules in GET location endpoint.

`opens_at` and `closes_at` are presented unmodified in ISO 8601 format.
`weekday` is stored as an integer in the database, but is presented as
the English weekday name, such as “Monday”.

This commit also changes the integer representing Sunday from 0 to 7 so
that schedules can be ordered starting with Monday.
Remove unused Coffeescript files.

The first Travis test failed, pointing to an unused asset.
It might have just been a glitch with sprockets, but I'm
removing all unused files.
Merge pull request #259 from codeforamerica/add-schedules

Add regular schedules