Added Dockerfile and docker-compose

[ghost]

A very blunt Dockerfile and docker-compose to run this on a system without node.
I'm cloning the repository into the image instead of using COPY or ADD to prevent cross-platform line-endings hassle. There's probably a more elegant way.

[magjac]

Thanks for the contribution and apologies for the delay. I'm willing to merge this if you can add why and how to use it to the README.

[ghost]

I've added a section in the README on how to use this. Regarding the why: installing make on Windows appeared to be a hassle, and I already had docker available. Hope it's helpful to future users!

P.S. Sorry about all the other commits, I thought I would update my fork first, but it appears this creates a whole new commit history in this pull request. Hope that's ok.

[magjac]

Can you please rebase this on the current master and get rid of the surplus commits and the merge commit?

[ghost]

After a few rides on the git reset/rebase/force push merry go round I think I got rid of the extra commits and rebased it onto the magjac:master branch (I've set your master branch as upstream, created a local branch of it and rebased my docker branch onto that).
I've addressed the missing new lines and extra whitespace as well.