Document docker-based installation instructions

[thisisdhaas]

We should probably split the installation instructions into the Docker install (default mode) and the "Developer / from source" install (with the existing text).

@EntilZha, could you take a stab at some brief documentation of how to get up and running on Docker? I'm happy to test it out once you've got something written.

[EntilZha]

Just a quick ping that I'me working on this as I have free time

[thisisdhaas]

Ok, great. One thing I was thinking of doing soon is switching the github.io page over to Jekyll (https://help.github.com/articles/using-jekyll-with-pages/). If you don't feel like dealing with the gross HTML on the gh-pages branch right now, you might want to wait on this until I've done that.

[EntilZha]

I can wait for that. Was writing them offline using Markdown and planning on inserting them into the right place.

[thisisdhaas]

better yet. If you just write them on this issue, I can handle the insertion into the actual docs.

[thisisdhaas]

Ok, I've migrated the docs over to Jekyll. Now editing the docs should be as simple as adding Markdown to the appropriate file on the gh-pages branch of this repo. In this case, that will be install.md.