Uniform plotting setting for notebooks

[bsipocz]

We may want to make a notebook equivalent of astroML.plotting.setup_text_plots as using the book optimized version is not ideal, out of the box, for the notebooks:

• we're running into LaTeX issues (see BUG: Latex issues with several notebooks on Binder #54) (using usetex=False is not viable workaround as then we lose the latex rendered axis labels.)

• the figures don't necessarily look good in the notebooks, they are most of the time are too small. Some of that maybe addressed by changing the fontsize centrally, and then enlarge the figure size in the cells.

• there maybe other adjustments to set in the rcParams that will make the notebook versions nicer, we should explore what they would be.