Changed execution of nosetests
I discovered maintainer meta-data parameter
Added URL into User-Agent string
Cleanups
Added alternative "python-goose" into README
Cleanup
Treat images a little differently so they get more inclusion

- When the body of the article contains screenshots/etc we want
to try to keep those images around.
- Added test for Business Insider article.
- Added sweetshark test.
- Added craig to the credits.
Append sibling node only when it doesn't already exist