Use Bundler gem conventions.
Add VERSION constant. Use latest version of appraisal.
Add appraisal to test across versions; fix support for capybara 1.0
Move development dependencies into the gemspec
Use RSpec 2.6 for any_instance support
Bundle rake, too.
Adding ability to render webpage to a PNG
The driver has a #render method which takes a destination file path and
an options hash for setting the dimensions of the browser's viewport
Move code that compiles Webkit into separate file to support Ruby 1.9.2
Added commented out integration specs