Add support for local file feeds

[jonbrett]

Add support for feeds loaded from a local file on the computer (i.e. not http/https). Such URLs would probably need to be prefixed by file:// and the feedreader backend updated to read a file instead of starting a SOAP HTTP request.

Originally posted by a user on my blog here: http://jonbrettdev.wordpress.com/2013/06/26/starting-my-second-cinnamon-applet-rss-feed-reader/#comments

[johni00]

can you add sound alert options, when new feeds came ?

[jonbrett]

@johni00 adding of sounds is already logged as issue #39.

I don't have time to implement this right now, but others have already kindly contributed features around that area so maybe it may get done sooner!