Overflow form input labels to new line.

Push input boxes to last line of label.
Fix for helptext overlap on input boxes.
Flow helptext to right of input boxes on forms.
Move shared/benchmark into tests
Move shared/khanload into khanload
Moving shared/testing to tests
Removing unused croncount script
Adding two missed "testing" import changes.
Moving shared/server to utils
Remove unnecessary dependence on settings.py
move shared/jobs.py to chronograph
code refactor to isolate chronograph from updates app
moving shared/videos into updates
Make flow of form elements vertical rather than 'table-like'.
Fix to prevent barrage of errors on cancel event.

Also - prevent continuation of download after cancel event on refresh.
Merge branch 'develop' of github.com:learningequality/ka-lite into eliminate-shared
Removed fixed width from form label.
Create separate exception catch for DownloadCancelled in video download Command.
Stop prevents launch of cron in force_job
Merge pull request #1532 from rtibbles/cancel_video_download

Fix to prevent barrage of errors on cancel event
Merge pull request #1471 from rtibbles/user_signup_overflow

Make text on all input forms to overflow properly