Remove and ignore .pyc files
Add a proper distutils setup, move into module, document install

The module was distributed as a plain Python file that users were asked to copy
into their projects. This should be avoided. Instead it should be installed
using distutils as a namespaced module, so one copy can be updated globally across
the system.

The code is moved into the __init__.py of the shiftplanning module. This is
completely backward compatible for existing code, but allows the module to be
split into separate files later, extra modules added without namespace issues,
etc.

A quick note is added to the readme to document how to install it sanely. In
particular it advises the user to install simplejson using easy_install or pip
if possible, rather than hand-copying it.
Remove copy of simplejson module; should be installed with pip/yum/apt-get instead
Merge pull request #2 from ringerc/convert-to-module

Remove 3rd party and generated files from versioning, convert to proper Python module, add install docs