Don't allow people to be invited to headless zones, nor to create any.
Merge branch 'software-keyboard' of git://github.com/jamalex/ka-lite into software-keyboard

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Signed-off-by: wangguan59 <wangguan59@gmail.com>
Windows script will now pull the production port.
Fixed the top navigation bar hover problem. Clean up some code in Khan-site and moved to Khan-lite, and group nav css together.
Moved JS from exercise.html/video.html
Removed delimiter.
update
update in video.html
Modify the code format, and make install link open in external window
Make hover effect globally, which allow both nav items and links have hover effects.
Merge pull request #319 from bcipolli/headless_zones_sandboxed

Sandboxing admin of "headless zones" dummy organization
This passed code review and we've got our model for release branching; merging into develop now.
Merge pull request #410 from wangguan59/nav_hover

Nav item hover
Merge pull request #407 from wangguan59/external_link

Open external link in new window
Merge pull request #409 from ruimalheiro/productionportwindows

Windows script will now pull the production port.
Thanks for doing this @ruimalheiro and for testing @jamalex !
Merge pull request #412 from ruimalheiro/videoexercisejscss

Moved JS from exercise.html/video.html
Thanks @ruimalheiro for addressing the comments and @jamalex for reviewing the code!
Merge branch 'develop' of git://github.com/learningequality/ka-lite into develop
Merge branch 'develop' into subtitles_hotfix
Adding in code to show subtitle counts on update page.