Updating rspec, sinatra, rake
Bump sinatra version (no Gemfile.lock)
Fixing Rakefile to work with upgrades; drop rcov
Update travis configuration.
Install rdoc, make travis happy
Merge pull request #39 from ryansch/update-test-suite

Update test suite
Cleanup and remove browser code.

This pulls many of the capybara changes from the base class in by not reimplementing those methods in our browser class.