Scancodeio

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- Add documentation and tutorial
For https://github.com/nexB/scancode.io/issues/8

- Add a create-project, add-input, add-pipeline, run, output
management commands to expose ScanPipe features through the command line
Fix for https://github.com/nexB/scancode.io/issues/13

- Always return the Pipeline subclass/implementation from the module inspection
Fix for https://github.com/nexB/scancode.io/issues/11

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- Do not fail when collecting system packages in Ubuntu docker images for
layers that do not install packages by updating to a newer version of
ScanCode Toolkit
Fix for https://github.com/nexB/scancode.io/issues/1

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- Initial release