Add bokeh support

As described in https://gitlab.ewi.tudelft.nl/mmc-tudelft/education/MMSRNotebooks/-/issues/38, we currently use bokeh in some of the notebooks so that students would be able to interact with their plots in Colab. As Colab doesn't allow us to use %matplotlib notebook we should provide a set of wrapper functions that based on the environment/provided parameter would either return matplotlib or bokeh visualisations. The bokeh functions have already been created by Shashank (https://gitlab.ewi.tudelft.nl/mmc-tudelft/education/MMSRNotebooks/-/blob/2020/Analytics/Colab/Analytics_lab3_ContentHighlight_Colab.ipynb) and just have to be added to cs4065 repository.