utilities

[joshspeagle]

While I already have very basic functions for plotting, I need to add in some additional ones for plotting/post-processing. At the moment, these include:

• [x] Constructing 2-D Av vs mu plots/grids.
• [x] Sampling Av/mu values from fits.

[joshspeagle]

I now have these an implementation of these up on a local version. I find the gridded version of the 2-D stacking is surprisingly slow, so I'm looking into a binned version as well building on the utility for generating random values. I might allow users to choose between the two depending on how well that goes.