Upgrade newrelic agent to the latest version
Move mitxmako initialization to a startup module, called by lms.startup and cms.startup for both management commands and when run via wsgi

[DEVPAIN-7]
Reset 'correctness' visual indicator of a problem on new input

Affects:
Choicegroups, option inputs, textline, and formula equation inputs
Merge pull request #794 from cpennington/upgrade-newrelic

Upgrade newrelic agent to the latest version
Merge pull request #811 from cpennington/initialize-mitxmako-at-startup

Move mitxmako initialization to a startup module
Updated acceptance tests to match new behavior in video captions.
using mocks to make test_err_handling.py faster
remove vestigal references to fake_smtp_server
restructure calc
specify preview import statements to reflect new package structure
change calcfunctions -> functions
bump version number on calc
Merge pull request #843 from edx/adam/calc-refactor

Adam/calc refactor
Merge pull request #841 from edx/jbau/bulk-email-faster-tests

Jbau/bulk email faster tests
Acceptance tests for visual correctness reset feature
Merge pull request #790 from edx/unanswered-on-input

Unanswered on input
Merge pull request #836 from edx/will/fix-video-caption-tests

Updated acceptance tests to match new behavior in video captions.
Incremented diff cover version to fix 100% coverage bug.
Merge pull request #847 from edx/will/fix-diff-cover

Incremented diff cover version to fix 100% coverage bug.
Use XBlock 0.3