Add demo
Add filesystem: URLs. Closes GH-1
Support multiple schemes, trying each returning first available (useful since filesystem: is not as well supported as blob:)
Add data: URL encoder (not using another existing module for now; possibly useful as a fallback if both filesystem: and blob: are unavailable)
Catch exception from XHR for Firefox NS_ERROR_DOM_BAD_URI: Access to restricted URI denied
Add documentation