make beta dash compute module_state_key like legacy dash (LMS-2491)
add failing tests
Refactor video caption module.
Test TemplateLookup dirs are not cleared during lms startup.

LMS-2498
make sure new lms/tests.py file is run
Use monospaced font for CodeMirror editor.

Cursor position gets off with non-monospaced font.
STUD-1456.

Vertical alignment of monospace font in advanced settings via position css adjustment
XModule datadog metrics
Merge pull request #3163 from edx/christina/advanced-settings-font

Use monospaced font for CodeMirror editor.
Merge pull request #3164 from edx/flowerhack/better-xmodule-metrics

XModule datadog metrics
Merge pull request #3153 from edx/anton/caption_refactor

Refactor video caption module.
Merge pull request #3205 from edx/usman/lms2498-mako-template-tests

Test that TemplateLookup dirs are not cleared during lms startup
Merge pull request #3187 from edx/adam/fix-alter-xblock-student-state

Adam/fix alter xblock student state
BLD-958: Force video player in flash mode.
Merge pull request #3195 from edx/anton/force-flash

Force video player in flash mode.
Updating acceptance test to really get several videos on
one tab.
Adding before and after screenshots.
Fixing bug.
Added decorator to all functions.