Features by Jeff Ericson and Nick Parlante squashed
down to one commit.

-shuffle of choices within a choicegroup (Nick)
-answer-pool subsetting within a choicegroup (Jeff)
-masking of choice names within a choicegroup, (Nick)
 used by shuffle and answer-pool
-targeted-feedback within a multiplechoiceresponse (Jeff)
-delay-between-submissions capa feature (Jeff)

Disable discussion service setting for lettuce tests

Convert lettuce video tests to bok choy

Temporarily disable CAPA problem "Check" button.

Merge release into master

Quiet some noisy loggers for lettuce acceptance tests

Add "Edit" button to each leaf xblock on the container page

Add repsonse pagination to inline discussions

Fixed typo in drag & drop

numbers -> number

Hotfix 2014-04-09

Fix video feature name so the test results roll up correctly

Removal of JS input chapter

DOC-254

Add info about accessing student progress through steps

LTI i18n 

Instead of noting users that are already in a cohort and not changing
such users, clobber the previous cohort and display a message indicating
the previous cohort membership.

JIRA: FOR-452