Make more dev utilities.

[FrenjaminBanklin]

The current set of dev utilities is useful, but could be expanded.

For example, it's currently not easy to really test the assessment stats panel in the dashboard because there's no real way of shortcutting the process of logging in and visiting a module as a student. The existing test instructor user(s) can be given ownership over the example module in order to see the assessment results for the single existing test learning, but that's about it.

Off the top of my head, some improvements could be:

• Allow a module to be specified in the dev utils for the student to visit.
• Allow for new students (maybe even new instructors) to be created with a button press.
• Allow for a specific student (or instructor) to be chosen for usage with the various functions (resource selector, login, module visit, etc.).
• Add roles/permissions (such as access to the Stats page).
• Anything else that would make sense and help with development.