I needed colorbars for matrix plots, so I added them. I also fixed a small bug in how keyword arguments were being passed in contour plot colorbars.

Apply:

1. attachment: trac-11976-matrixcolorbar.patch
2. attachment: trac_11976-colorbar-sizing.patch

CC: @kcrisman

Component: graphics

Author: Jason Grout

Reviewer: Rob Beezer

Merged: sage-4.8.alpha5

Issue created by migration from https://trac.sagemath.org/ticket/11976