grim/hgwebplus

Add the ability to install static files to hgweb static path and include graphv2.js which is an updated graph from mercurial.js
0.3.1:
* Added a ChangeLog.
* Always make the line numbers available in the diff template.
* Added the ability to install static files into the hgweb templates static
path.
* Added graphv2.js which is an updated version of the graph class in
mercurial.js that aligns properly.
0.3.0: (2020-05-04)
* Render README and README.txt files with the Markdown renderer.
0.2.0: (2020-04-10)
* Added README.md and licensing.
* Added docstrings to everything.
0.1.0: (????-??-??)
* I didn't take any notes 😭.