Random variable: Missing features

[RobbieKiwi]

• When plotting a mixture distribution, the PDF should correctly display dirac deltas in the case when there is a mixture between a continuous and a discrete pdf
• There should be the ability to add clipping to pdfs (E.g make a normal distribution with a hard lower bound). Could this be handled by scipy?
• Use scipy wherever possible, don't re-implement anything that already exists. continuous rv