```text
virtualenv -p /usr/bin/python3.4 env
source env/bin/activate

pip install -r requirements-dev.txt
python setup.py develop
```

```text
virtualenv -p $(which python3) env
source env/bin/activate

pip install -r requirements-dev.txt
python setup.py develop
```

Change dev instructions to a more portable form.
Change dev instructions to a more portable form.
