Merge pull request #1 from HaxeFlixel/dev

Merge current dev.
FlxAssets: getFileReferences() fix

For filterExtensions to work properly, ‘continue’ should be used
instead of ‘break’.
In the current implementation, the loop stops as soon as it finds a
file with an extension not included in filterExtensions.
Merge pull request #1211 from davidcollado/dev

FlxAssets: getFileReferences() fix