Update rspec-rails
Add config.infer_spec_type_from_file_location! option

rspec-rails 3 will no longer automatically infer an example group's spec
type from the file location.
Avoid deprecated be_{true,false} matchers
Install rspec-activemodel-mocks for stub_model
have(n).items syntax is deprecated
`expect { }.not_to change { }.to()` is deprecated
Update capybara
Remove "require 'rspec/autorun'"

Requiring `rspec/autorun` when running RSpec via the `rspec` command is
deprecated.
Merge pull request #171 from eagletmt/rspec3

Upgrade to RSpec 3