make edit link use static_asset_path in xmodule_modifiers.py
Merge branch 'master' of github.com:edx/edx-platform into bugfix/ichuang/make-edit-link-use-static-asset-path

Conflicts:
	common/djangoapps/xmodule_modifiers.py
lms namespace removed
module -> block in common/djangoapps/xmodule_modifiers.py
Merge branch 'master' of github.com:edx/edx-platform into bugfix/ichuang/make-edit-link-use-static-asset-path
Events for entering verified flow & buying
Added refund datetime info to Orders, OrderItems

Finance would like to have info about the date any given refund is requested.

This commit adds a refund_requested_time field to OrderItem and a refund_time to Order.

When a user *requests* a refund, the refund_requested_time field on OrderItem is updated; when a user actually *receives* their refund, the refund_time on Order is updated.

Note that only the refund_requested_teim field is actually used right now; later on, when we're able to actually automate the process of actually giving users refunds, we will start usings Order's refund_time field.
Response to CR
Quick fix
Response to CR
Added alternate upsell copy flag

For waffle / split testing purposes
Added segment.io tracking
Activate Markdown editor buttons on keypress

The buttons now activate on pressing space or enter.

JIRA: FOR-66
response to cr
Remove forum user profile moderator toggle button

This button has been broken for at least a year, so the code has
suffered from bit rot and should be reimplmemented if the feature is
necessary in the short term (which is unlikely since it has been broken
for so long).
Created "MathJax in Studio" page

Created "A Brief Introduction to MathJax in Studio" page (as appendix
G) and included a link in "Math Expression Input" topic.
Add debug logging of exceptions that happen during rending of studio_view or student_view in Studio
Add underscore to staff grading template
Merge pull request #1903 from edx/will/fix-underscore-staff-grading

Add underscore to staff grading template
Merge pull request #1898 from edx/sylvia/documentation/bld-552

Created "MathJax in Studio" page