Quick initial integration of software keyboard into KA Lite exercises.
Merge branch 'css_cleanup' into software-keyboard
Tweaks to styling for software keyboard.
Adding other mather notations.
Adding clear input field function.
Fixed "next question" displaying issue
Showing Numberpad
Only show the numberpad if it is an andriod device.
Fix some formats
Signed-off-by: wangguan59 <wangguan59@gmail.com>
Merge branch 'develop' into software-keyboard
Show up on all the devices.
Merge pull request #2245 from learningequality/nalanda-rct2

Nalanda rct2 updates
only add to the dubbed video map if lang_name is present
remove subtitle from list of playlist ids
Quick initial integration of software keyboard into KA Lite exercises.

Conflicts:
	kalite/distributed/templates/distributed/exercise.html
	kalite/static/js/khan-exercises/khan-exercise.js
	kalite/static/js/khan-exercises/utils/answer-types.js
Moves software-keyboard to new location.
Implements first pass of Backbone driven software keyboard.

Conflicts:
	kalite/distributed/static/css/distributed/khan-lite.css
Makes numpad appear for all applicable answer types.
Fixes on screen keyboard to only appear for Android devices.