Add warning regarding non-interactive plots
Add warning regarding non-interactive plots

Close #142.

anhiga/poliastro,newlawrence/poliastro,Juanlu001/poliastro,anhiga/poliastro,Juanlu001/poliastro,newlawrence/poliastro,anhiga/poliastro,Juanlu001/poliastro,newlawrence/poliastro,poliastro/poliastro