Disables the previous/next arrows on pdf books on the first/last pages respectively
Upgrading to 1.4.8
Added setting to disable find courses links
Renamed setting ENABLE_STUDENT_SELF_ENROLLMENT to COURSES_ARE_BROWSABLE
If setting COURSES_ARE_BROWSABLE is off return 404 on /courses
Removed hardcoded case for edge for /courses
Fixed js coding style for pdf arrows toggle
Updated copy in dashboard
First caption does not display outline on initial mouseover.
Make discussion elements change color on focus

Previously, colors changed to afford interaction only on hover; now, all
elements with a hover color change behave the same way on focus.
Display:none arrows in disabled state
Visual rearrangement of new dash "Student Admin" page
Enable use of student usernames on student admin page

This is in addition to email addresses, which also work.
Fix, and add more, tests
Enable alerts when a task succeeds.

Note: Alerts are pop-up boxes. Not sure if this is desireable, but I couldn't figure out
how to make a success message show up in the same place that error messages do.
Add more feedback for instructors on Student Admin section of the dash.
Moved jquery event handling to parent since hidden elements do not get events attached
Move Pearson courseware imports to function level.
Merge pull request #1159 from edx/gprice/forum-focus-color

Make discussion elements change color on focus
Merge pull request #1155 from edx/sarina/ins-dash-student-admin-2