Chordparser

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* Fix incorrect roman scale conversion

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* Fix imports for autodoc to show documentation properly

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* Reorganised documentation to follow Divio documentation
* Updated README with quick demo
* Completed Colab notebook as a tutorial and showcase
* Included first draft of reference documentation in NumPy documentation style
* Catch errors in Parser if ``Parser.sample`` fails to be read
* Changed some keyword argument names to better fit with documentation

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* Updated ``analyse_secondary`` method to be limited to secondary dominants and secondary leading tone chords by default
* Fixed ``analyse_secondary`` method to return an empty string if the next chord is the tonic

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* Include ``analyse_secondary`` method

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* Fix accidental print in NoteEditor
* Include ``__str__`` representation for printing musical classes
* Fix file reading for Colab notebook