adding env to jupyter code example

Example 1: add conda env to jupyter

source activate myenv
python -m ipykernel install --user --name myenv --display-name "Python (myenv)"

Example 2: jupyter from virtualenv

$ python -m venv projectname
$ source projectname/bin/activate
(venv) $ pip install ipykernel
(venv) $ ipython kernel install --user --name=projectname