Improved sanitizer

Can now remove some empty paragraph tags
Parser now detects non-xml

Fixed ability to subscribe to non-rss/atom xml files, added bookmarking
Improved fetching

Better error handling, mime type checking, fixed up fetcher callbacks,
Use addeventlistener instead of onX property
Switch to native timeout handling in fetcher

Use request.timeout and request.ontimeout instead of setTimeout(...)
stuff.
Fetcher now sends Accept header
URL validation and notifications

Added basic URL validation, fixed the permissions for notifications and
notifications feature, using latest chrome API calls