Add RSS 0.91 sample

Downloaded from http://cyber.law.harvard.edu/rss/examples/sampleRss091.xml
on Mon May 20 17:53:47 CEST 2013

Licensed under Attribution/Share Alike Creative Commons license.
Add RSS 0.91 unit test

Closes #8
Add RSS 0.92 sample

Downloaded from http://cyber.law.harvard.edu/rss/examples/sampleRss092.xml
on Mon May 20 18:04:51 CEST 2013

Licensed under Attribution/Share Alike Creative Commons license.
Add RSS 0.92 unit test

Closes #9