Changed call to requestAnimFrame in loader.js

Noticed a JavaScript error in IE9, which was caused by the call to
requestAnimationFrame in loader.js
Check for spaces in room name creation
Error message for when an upload is too large

Added an error message for when an upload is too large.
Merge pull request #1189 from lagwagone/dev

Error Message when file upload is too large, protect against spaces in room name on client's create room functionality, make room loading animation work better in IE9