Remove rating_key

rating_key is not required when using a URL Service
Remove unused var 'video_url' in MetadataObjectForURL
Remove unused import of 'inspect' module.
Remove unused import of 'urllib2' module.
Remove unused var BASE_URL
Fix HTTP_HEADERS dict
Add missing '. Use tabs for indentation everywhere,
Replace re.xxx with Framework Regex()
Remove unused import of 're' module.
Remove unused HTTP_HEADERS
Remove commented out code block
More consistent var names.
Merge pull request #1 from sander1/master

Small fixes