Merge pull request #113 from mfraezz/dev

Functionality update
Merge pull request #114 from mfraezz/dev

Fix mfr_movie, mfr core imports, pdf path
Add support for PV protein rendering library
Merge pull request #115 from mfraezz/features/pv

Add support for PV protein rendering library
Add render requirements for PDB
Merge https://github.com/CenterForOpenScience/modular-file-renderer into features/pv
Merge pull request #116 from mfraezz/features/pv

Add render requirements for PDB
Fix installation setup
Merge pull request #117 from mfraezz/features/pv
Add support for the PV protein renderer
Fix setup
Misc bug fixes - tabular, ipynb
Fix docx/unicode encoding error
Update documentation
Update documentation
Update documentation
Merge pull request #118 from mfraezz/features/pv

* Purpose
--------------
The GLmol protein renderer had limited functionality, being able to properly render approximately one third of all test files. PV performs better but still can't render amino acids.

* Changes
--------------
Make PV the default pdb renderer
Improve Documentation

* Side Effects
--------------
Some minor bug fixes, including a check that will prevent UnicodeEncodeErrors when rendering .docx's.
Fix error message when unable to render file
Was: 'No available handler that can handle [long_hashstring].html.[ext]'
Is: 'No renderer currently available for this file type.'
Fix render requirements
Strip content of all style before rendering
Merge pull request #119 from mfraezz/features/pv

Update mfr_docx to use more recent pydocx version
Remove pins to outdated requirements
Closes `https://github.com/CenterForOpenScience/modular-file-renderer/issues/111