Autoplay videos, and add string for future feature allowing disabling this
[Finishes 59713798]: CSS alignment fixes for header + use checkmark image + fix dashboard left margins
Merge branch 'master' of github.com:code-dot-org/dashboard
Remove some cruft from nginx.conf
Make continue button a real button to fix styling
Modify css and js to force cache busting
[Finishes 59813542]: change string, fix wrapping and padding, draw top-left logo over rest of header
Merge branch 'master' of github.com:code-dot-org/dashboard
only send a wrap up video back, if there is one
add cheesy method to bust js cache
turn on spanish in prod
Fix spacing issues
Add missing group by
Only increment attempt count until they've gotten the perfect score
store 20-hour script in a static method rather than a static variable.

this protects it from being queried when other static variables are loaded (when the db may not yet exist)
Move readline stuff to dev so it's only installed on vagrant.
Get read of readline because it's buggy.