Export multiple MD documents to multiple HTML files at once

[riandrake]

Just a quicker method of exporting X Markdown files into X HTML files. Hitting "Ctrl-Shift-1 Enter Enter" on multiple tabs isn't very efficient.

Could be either:

1. Export session
2. Export folder
3. Export open tabs
4. Some command line export that I can write to a batch file.

The last one would probably be the most ideal for me, so I can write one that best suits my project(s) myself.