Make repo password required

[johnmaguire]

Currently, there's no indication that a password is required. If you try to submit the form without one, you get an error flash message:

This PR makes it so you can't submit the form until a password is entered (a single character password is accepted.) It also adds a warning if you click off the field without entering a value.

Unfortunately I could not figure out how to get the Password label to show the required symbol...