Adds info links to capybara screenshots in rspec suites

If you enable capybara-screenshots[1] then this will add automatic
linking to the html and png images it generates when there is an error,
or it is requested.

1. https://github.com/mattheworiordan/capybara-screenshot
Limit the hyperlink on an error to the filename

Stop underlining preceding "rspec "
Merge pull request #82 from dgtized/capybara-screenshot-links

Capybara screenshot links