rename 'version' to 'minversion' for versioned syncing
adding a command-line utility for executing common testing functions
missing delete function on config.
Merge branch 'develop' of github.com:learningequality/ka-lite into rename_to_minversion

Conflicts:
	kalite/utils/general.py
new katest management command "clean_db"
preventing central-server regret
refactor confirm logic in katest clean_db
Merge remote-tracking branch 'gimick/katest_tool' into katest_tool

Conflicts:
	kalite/management/commands/katest.py
Don't allow people to be invited to headless zones, nor to create any.
Merge branch 'develop' of github.com:learningequality/ka-lite into rename_to_minversion
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.
Merge pull request #269 from bcipolli/rename_to_minversion

Rename model/field property "version" to "minversion"
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.