The "graphviz" Python module is required. Clarify that within the requirements.
(the graphviz/dot commands are needed at the OS level, but that can't be fixed here)
There are hard copies of the graphviz and pyyaml dependencies included
in the repo. Remove these.
Sort out installation and dependency handling by writing a functional
setup.py script. Rename top level documentation. Refactor wireviz.py
slightly to allow it to run as an installed script.
# Conflicts:
# src/batch.py
# src/wireviz/batch.py
# src/wireviz/build_examples.py