Conflicts:
	djangoapps/courseware/capa/responsetypes.py
	djangoapps/courseware/module_render.py
	djangoapps/courseware/modules/html_module.py
	djangoapps/courseware/modules/seq_module.py
	djangoapps/courseware/modules/x_module.py
	djangoapps/courseware/views.py
	templates/main.html
	templates/problem.js
	templates/textbox.html

is completely contained within lib/dogfood, and it can be cleanly unplugged
from the rest of the code.

for now

with external server into ExternalResponse.do_external_request

for getting expected answer from external server, add error handling,
extend to use json for multiple input fields, added rows & cols to
textbox inputtype for code input.

also some changes to try to fix the codemirror problem

cleaned up some cruft prints -> logging

symmath library; add options for matrices, qubit to symmath_check

after click due to call to content_updated(); fixed this.

generated when Check is clicked)

capture the error message and traceback and show this as the problem text.

main.html now includes mathjax_include for all mathjax stuff
problem.js refreshes mathjax formulas on change
all previous *_fromjs renamed to *_dynamath, eg textline_dynamath

Pmitros/dexml

Create dev env

Fix page jumping bug when click on the speeds list

Trigger a pause event when user click Youtube logo

Fix problem with sequence navigation on iOS