Add apt-get imagemagick to dockerfile
Add apt-get imagemagick to dockerfile

In order for pycortex to be able to render SVG-based regions of interest on flatmaps, it turns out that we need the imagemagick `convert` binary installed. I added a line to install all of imagemagick. 

Is there any chance for this to be staged + added to production by tomorrow? (That is the date of our last cogneuro connector class and it would be amazing if we could have this functionality for it).

Thanks!
Michael
berkeley-dsep-infra/datahub,berkeley-dsep-infra/datahub,ryanlovett/datahub,berkeley-dsep-infra/datahub,ryanlovett/datahub,ryanlovett/datahub