VOLDEV-4: Show the "Previous" button in rail module
Missing quotes in media.class.js
MOB-371: Use ParserPool for rendering the rest of gallery
VOLDEV-4: Make the "Next" button show up when returning to the first
page
VOLDEV-4: Remove extraneous Math.floor() for boolean check
Merge pull request #1412 from WikiaVolDev/VOLDEV-4-achievements-previous-button

VOLDEV-4: Fix Achievements rail module button behavior