Move to RSpec 2.99
Update truthy/falsy Rspec deprecations
Convert specs to RSpec 2.99.0 syntax with Transpec

This conversion is done by Transpec 2.2.0 with the following command:
    transpec

* 199 conversions
    from: obj.should
      to: expect(obj).to

* 33 conversions
    from: obj.should_not
      to: expect(obj).not_to

* 25 conversions
    from: == expected
      to: eq(expected)

* 24 conversions
    from: obj.should_receive(:message)
      to: expect(obj).to receive(:message)

* 8 conversions
    from: describe 'some model' { }
      to: describe 'some model', :type => :model { }

* 6 conversions
    from: describe 'some feature' { }
      to: describe 'some feature', :type => :feature { }

* 5 conversions
    from: obj.stub(:message)
      to: allow(obj).to receive(:message)

* 1 conversion
    from: describe 'some helper' { }
      to: describe 'some helper', :type => :helper { }

See also: https://github.com/yujinakayama/transpec#supported-conversions
Enabled spec type inference - Rspec 3 deprecation
Update to RSpec 3
Switched to using pre-release capybara to remove dependency warnings.