Merge to master for patch/2016-11-03

Fix instructor dashboard data download pending task message

Patch 2016-11-03: LTI mgt command merge to release

Add 404 and 500 handlers back in.

handle refund notification message formatting when translated with un…

Implement DateUtils in LMS

[PERF-386] Utilize ForumsConfig to enable and disable forums.

Update translations (autogenerated message)

Switch to using nodeenv

* Implement the newrelic_custom_metrics middleware
* Instrument DjangoXBlockUserStateClient with New Relic

Report to New Relic certain per-request details about the
DjangoXBlockUserStateClient.  The following metrics are reported for the
get_many() call:

xb_user_state.get_many.calls
xb_user_state.get_many.duration
xb_user_state.get_many.blocks_requested
xb_user_state.get_many.blocks_out
xb_user_state.get_many.size
xb_user_state.get_many.<block_type>.blocks_requested
xb_user_state.get_many.<block_type>.blocks_out
xb_user_state.get_many.<block_type>.size

Similarly, for the set_many() call:

xb_user_state.set_many.calls
xb_user_state.set_many.duration
xb_user_state.set_many.blocks_created
xb_user_state.set_many.blocks_updated
xb_user_state.set_many.size
xb_user_state.set_many.<block_type>.blocks_created
xb_user_state.set_many.<block_type>.blocks_updated
xb_user_state.set_many.<block_type>.size

Where <block_type> is one of "chapter", "course", "problem", "video",
etc.

PERF-354

Use this middleware and its helpers to accumulate custom New Relic
metrics on a per-request basis.  If, while handling a request, the app
does not accumulate any metrics, this middleware is a very lightweight
no-op.

This commit also enables the middleware!

PERF-354

This specifically enables/disables the underlying comment service client
used to make calls to the service.  When disabled, this client will now
throw an exception which can be propagated upwards so that callers can
make the right decision about how to notify users of the error, or
handle retry, etc etc.

Patch release with mgt command to resend LTI scores.

Create management command to send lti_provider scores to lti consumers.

Revert "format xml before displaying"

Revert commit bf9d467f

Update xblock-lti-consumer version.

Hotfix 2016-11-02 Release to master

Use fonts from the Pattern Library

Update release with latest release-candidate

TNL-5778

Update to reduce flakiness of this test set removed flaky annotation

problem-builder's tags are vX.Y.Z not X.Y.Z

TNL-5582

log pip freeze output for debugging jenkins builds

Updates problem-builder version to match master

Add grades feature check to subsection task handler.

Ref: https://github.com/open-craft/problem-builder/pull/119

Upgrade to django 1.8.16 for the security release