Dockerization of Hawking

[naschorr]

Build up a docker container for simple setup and spinup of the bot.

Some considerations:

• Is there a best practice for passing sensitive keys to the container?
• Is there a nice way of passing production configuration files to the container, or is a volume binding the best way? Maybe environment variables that override the default config.json properties?
• What about additional phrases? Normally those are git cloned into an adjacent directory that the bot knows to pull from. I guess this could be another volume binding, or maybe it could automatically pull the latest phrases on initialization?