Addition of 3 TinyMCE plugins

The following plugins added to toolbar in Edit of Unit:
 - fontselect
 - forecolor
 - image
Remove unused massemail commands.
fixed conflict between Annotator and internationalitation
fix partial work done for changes in django-debug-toolbar-1.0.1

add trailing comma, restore uncommented state of Mongo panel
update version for django debug toolbar
Merge pull request #2548 from edx/diana/drupal-registration-i18n

Don't internationalize strings we use for enrollment.
i18n Sequence XModule
BLD-824: Download Video link missing from video player.
Merge pull request #2560 from edx/sarina/fix-i18n-xmodule-sequence

i18n Sequence XModule
Merge pull request #2493 from danielcebrian/daniel-branch-fix

fixed conflict between Annotator and internationalitation
Merge pull request #2554 from edx/anton/fix-video-import

Video: Fix for Download Video link.
fixes for verification ui discrepancies
UX-351
splash-screen: Add ability to redirect to a splash screen URL

Checks for the presence of a cookie with specific values when activated,
and redirect the user to a configurable URL when it is not found, or not
with an accepted value.

To be used to display a splash screen to users upon the first visit.
It's the responsability of the splash page at the redirected URL to set
the proper cookie value before sending users back to the LMS.
First draft 2-12-14 release notes
Clean up of modulestore references (primarly LMS).

STUD-1151
fixed missing polyfill buttons, adjusted layout of number input in component editor
UX-381
Merge pull request #2561 from edx/frances/studio/bug-editor-number-layout

Fixed missing polyfill buttons and adjusted layout of number input 
UX-381
Update Esperanto (dummy) translation files
Merge pull request #2403 from edx/dcadams/tinymce_mods

Addition of 3 TinyMCE plugins to toolbar
Merge pull request #2564 from edx/sarina/new-esperanto

Update Esperanto (dummy) translation files