Fix tests and use web-console for dev only

[nicolasleger]

Avoiding the error below when running bundle exec rake :

Web Console is activated in the test environment, which is
usually a mistake. To ensure it's only activated in development
mode, move it to the development group of your Gemfile:

    gem 'web-console', group: :development

If you still want to run it the test environment (and know
what you are doing), put this in your Rails application
configuration:

    config.web_console.development_only = false

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[nicolasleger]

I signed it!

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