Fixing accessibility bug where users could not tab through on wiki

LMS-1307
Delete unused HTML templates.
updating boto to get boto.elasticache.layer1
Fixes to release.py script
Ensure that peer grading modules whose linked problem is removed change over to panel mode
Added wait for JavaScript when navigating to textbook page
Ignore certain emails in release script
Merge pull request #1524 from edx/rc-peer-linking

Ensure that peer grading modules whose linked problem is removed change ...
Merge pull request #1517 from edx/christina/delete-unused

Delete unused HTML templates.
Merge pull request #1522 from edx/db/fix-release-script

Fixes to release.py script
Update tabs.py
Update AUTHORS
Studio: resolves a display issue with prompt UIs hiding throughout app
Clean up imports
Give a better error message when capa recieves an unknown action
Make sequence module use ajax_url properly
Merge pull request #1530 from edx/talbs/fix-cms-prompts

Studio: FIX - Prompt UI Display
Studio: resolves issue where datepicker UI had no background-color
Merge pull request #1532 from edx/talbs/fix-studio-datepicker

Studio: FIX - Datepicker UI Background
Merge branch 'release'