initial commit with simple entry point and messages
upload entry point returns file url
manually merged changes from MOB-1543
manually merged changes from MOB-1543; resolved conflicts in i18n file
resolved JSHint issues
resolved JSHint issues (removed two unused vars, added semicolons)
WIP: upload works but event listener is added in wrong place
restored previously removed variable and re-used them to add event listener in a better place
code review changes in JS
code review changes: simplifying PHP code
merged up-to-date MOB-1543 and manually resolved conflict in WikiaInteractiveMapsCreateMap.js
Merge pull request #3643 from Wikia/MOB-1543-file-upload

MOB-1543 AJAX file upload