updated pdf viewer
Add some optional policies around password resets, such as password reuse, forced password resets, allowed frequency of password resets
password history: just limit the result set range to simplify iteration logic
remove double icons in the wiki sidebar
switching more wiki icons to use the right format
make beta dash compute module_state_key like legacy dash (LMS-2491)
add failing tests
Refactor video caption module.
Upgrade django_nose to 1.2
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
This should enable logging of codejail on prod
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.