"Enhanced the advanceTags menu for editing metadata"
removed empty line created in last commit
added checkbox to main metadata editor
cleaned up added some additional comments
Merge branch 'EnhancedMetadataEditor' of https://github.com/luisgmarine/nightingale-hacking into EnhancedMetadataEditor

Conflicts:
	app/content/scripts/trackEditor.js
	app/content/xul/trackEditor.xul