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Deprecate invoke() without arguments.
Refactor invocations and make it simple.
Added more specs to class method invocations.
Make specs pass on Ruby 1.9
Improving shell capabilities and add Thor::Shell::Color.
Spec'ing new behavior.
Cleaning up invocation and prepare.
More parser refactoring.
Ensure that an error is raised even if all tasks were already invoked.
Split base_spec into shell_spec and invocation_spec.