Update Loader.js texture double slash fix

previous was :
var fullPath = texturePath + "/" + sourceFile;
but texturePath may already have a slash (see extractUrlBase function)

changed slash to texturePath.slice(-1) === '/' : '' : '/'
Typo fix for previous commit
Merge remote-tracking branch 'Baccanno/patch-1' into dev
Loader: Trying to simplify the code.
Updated builds.