First clone with submodules installed:
git clone --recurse-submodules https://github.com/simonalford42/abstraction
If you've already cloned, try
git submodule update --init --recursive
to get the submodules added.
Then install the requirements:
python -m pip install -r requirements.txt
Then you should be good to go.
If you want to install pycolab code do cd lib/pycolab and python setup.py develop. Using develop ensures that changes to the pycolab code take effect.