Initial commit of source code

This is the state of the code base as soon as hard-coded values such as
Publisher IDs and API tokens have been removed. There's still very
little documentation yet.

* Update README.md to highlight pre-alpha state of software

* Add BCAccount class to hold Publisher ID and API tokens

* Add methods to request and print video report (Analytics API) and
  video metadata (Media API)

* Ignore driver.py containing personally identifiable information and
  *.pyc generated files