initial commit
enable some hubot scripts and `npm start`
fix docker build and default to shell adapter

Build Docker image from node image instead of node-onbuild image so
HipChat adapter dependencies could be installed before running `npm
install`.

Build the image so it just runs the shell adapter by default; leave it
to descendent images to configure and run with the HipChat adapter.

Modify the README.md to describe how to use Champ in Docker, and remove
most of the boilerplate created by Hubot.
Merge branch 'feature-dockerify'