Bug 868852 - Support Phonegap's/iOS pseudo-absolute paths in src and href. r=gandalf

This specific issue hit me when using l20n in iOS app, on Phonegap.
file:///<filesystem>/AppName.app/www/ is the docroot there. Path to manifest
file was relative (don't really want to set the absolute path), but it did not
seem to resolve like that. Using .href instead of .getAttribute('href') will
return the already interpreted full path, which does resolve well.