update rspec version and syntax from should to expect with transpec
Merge pull request #236 from adamjonas/master

update rspec version and syntax from should to expect with transpec
Check that Gemfile exists before trying to call bundle exec which wkhtmltopd. Fixes #230.
Merge pull request #245 from jarrett/master

Check that Gemfile exists before trying to call bundle exec which wkhtml...
Upgrade to rspec 3

Fix an odd bug in the Middleware
Add failing test for #183
Change how we construct the command to fix #183