Help folder / documentation

[ceholden]

So since we don't have the usual documentation for this yet, yank out the help folder entirely. This isn't some kind of API so a Sphinx based documentation style that came with the Plugin Builder defaults isn't useful. Would prefer to just write documentation that is accessible via Github (gh-pages too?) as markdown, which gets built into HTML if anyone wants it within the deployment. So:

• Rip out existing help folder and fix Makefile
• Write documentation for how to use the plugin
• Write documentation for how to write a timeseries driver
• Re-create Makefile to use pandoc to go from markdown to HTML
• gh-pages site? https://help.github.com/categories/github-pages-basics/
• Link to repository and help pages from plugin