v0.13.0

Changed

• In Clearance's optional generated features, use pure Capybara instead of
  depending on Cucumber's removed web_steps, paths, and selectors.
• Extract SHA-1-specific code out of User into PasswordStrategies module.
• Extract sign in form so that other methods can be added easily.
• Test against Rails 3.1. Required upgrades to Diesel and Appraisal.

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