Add biscuit.generate

* Setup unit-testing method using mocha
* Add biscuit.generate and bin/biscuit.js for interacting with biscuit API via command line.
:wq
Add TODO regarding test artifacts.
Clean test output before each test run, disable "clobbering" by default, remove console.log statements(for now).
change _test.js to -test.js
Add README with proposed API.
Rudimentary development http server for biscuit.
Add start-server and stop-server commands.

* Add "oven", the simple biscuit http server (intended for development) which "bakes" a biscuit
  with each request.   If an error occurs during the baking process, that error can be sent to
  the browser, thus preserving the traditional change + "reload" pattern of development.
* Add mechanism by which various "ovens" can be started and stopped as independent child processes.
* Adjust cmd.js to handle promises returned by various commands and control output / exit status
  accordingly.
Update README to reflect latest API changes.
Update description in package.json