Email content history fix and additions

This addresses a bug in the email content history table where
"Unknown" was displayed in the number of emails sent column if any sort of
failure occurred during email sending. This behavior has been editted so now
the number of emails that failed to send is displayed, along with the number
of emails that were successfully sent. If the email task is still pending,
"0 sent" is displayed.

As a small addition, the table now also includes the authors of previously
sent emails, and the modal window for an email also displays its author.

Minor i18n fixes prompted by translators

Release

Hotfix/2014 08 14

Update django-splash.

Generalizing CONTRIBUTING.rst to all repos

STUD-1999

STUD-2090

The new release supports wildcards in path exclusion rules.

Check REQUEST_CONTEXT.context exists before accessing it.

LMS-11226

BLD-1125: Validate content experiments after managing a group.

Include Optimizely on the platform

Release edx-jsme 1.0

Release edx-jsme 1.0

Support ipv6 in geoinfo and Embargo

Sarina/annotations fixes

Annotation Tools: Adding Annotator to CMS

 - fixed spaces after commas, if conditions, braces, operators
 - fixed some typecasting issues as well

 - added missing semicolons

Documentation: create_sinon.js - update referenced JIRA issue.

Annotation Tools: Fixing implicit typecasting and reordering plugins

Verify loading indicator has been hidden.

Resolving merge conflict between master and release

STUD-2090