CON-1303: Changes in Manage Wikia Home to support marketing slots
CON-1303: Added validation for marketing image
CON-1303: Display marketing slots on wikia home page
CON-1303: Added messaging
CON-1303: Removed console.log
CON-1303: Moved image size values
CON-1303: Changes in JS
Merge branch 'dev' into CON-1303
CON-1303: Support for old version of hub slots
CON-1303: Fix for displaying hub color on wikia homepage
CON-1303: Address code review
CON-1303: Better support for images
CON-1303: Added 3rd slot for marketing
CON-1303: Added validation to marketing slots
CON-1303: Added default border color
CON-1303: Fix error messaging
CON-1303: Removed px unit from messaging
CON-1303: Change color border for marketing slots
CON-1303: Added default border color for mobile home page
CON-1303: Added filtering urls