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If you are using capybara-webkit gem that you should install QT 4.7+, if you need to use pushState/replaceState. Also defining those functions with mock implementations is another good solution.
The gem term-ansicolor has been removed from the heroku gem. It is still a dependency of foreman which is used by the lastest Heroku stack. The license on gem term-ansicolor is gplv2.
Guard with spork takes away a lot of the pain of using spork. Use the gem guard-spork which takes care of building you a sample guardfile. It takes care of restarting the appropriate framework you have in use be it test unit, rspec or cucumber.