This patch does some refactoring of the code and the directory
structure to conform to the needs of a pypi project.
The python code now lives in the aprsd directory so it acts like a real
python package that can be installed/included/used.
The aprsd.py is now aprds/main.py
This patch also adds support for using pbr, which enables a consistent
bin install that you can then call as 'aprsd' from the command line.
To use this as a developer you should create a virtualenv
virtualenv .venv
source .venv/bin/activate
pip install -e .
now you can edit the aprds/main.py and then test it by immediately
running aprsd from the command line.
The -e option for pip allows you to install the package as an editable
package in the .venv, so you can hack on it and not need to re-install
every time you make a change.
