Preliminary multi scene serving support.
Merge branch 'master' into multi

Conflicts:
	scenes/index.xml
	scenes/lightmap.xml
Standardise logging.
Added index.json that lists all files in the directory.
Server script.
Better error reporting.
Disable indexes for now.
Moved addEventListener to /vendor/. Refactored how documents and nodes are created. No more document singleton.
Refactored to use document and document.scene instead of scene global.
Remove use of document global.
Dispatch the correct event.