Fix pylint violations from #2129
1st draft external graders doc
External Graders First Review Draft
Update video component documentation
Always add Plural metadata to dummy translations.

When this was conditional, we'd have plural info in some files, not in
others. Then we'd merge them, and msgcat would add wacky markers to
indicate the difference, and the metadata wouldn't parse.
Tighten up the extraction I/O

We were writing the main file twice.  No need.
Don't force modulestore initialization when running lms manage.py, only when running via the wsgi file
Remove obselete cms startup code
Fixed all instances of "occured" typo
BLD-699: Fix i18n.
Merge pull request #2243 from edx/anton/video-i18n

Internationalize the video player.
Give numerical response tolerance as a range (for example [5,7)) (BLD-25)
Merge pull request #2231 from edx/alex/numtolerance_range

Alex/numtolerance range
BLD-711: Fix offest in FF.
Merge pull request #2303 from edx/ned/i18n-tool-fixes

Ned/i18n tool fixes
Merge pull request #2315 from edx/anton/fix-imageresponse-offset-in-ff

Imageresponse: fix offset in FF.
Moved brew-formulas.txt to Brewfile

http://robots.thoughtbot.com/brewfile-a-gemfile-but-for-homebrew
Enable i18n tests in `rake test` command

LMS-1963
fix regression for stringresponse problems with unspecified case sensitivity (BLD-710)

write failing tests
Update .sjson information and add new Video component image