fix plots

Make the plots color and remove very fine gridlines.
modify rc file

Remove colormap setting.  Don't force all plots to be grayscale.
Also make bounding boxes tight by default.
fix image path
Merge pull request #637 from ayr0/pcolor

Matplotlib fixes
Added configuration for travis build.
It currently only works for volumes 1, 2, and 4, and takes a long time to
install all the LaTeX packages.
Merge branch 'develop' of https://github.com/byuimpact/numerical_computing into travis
Another attempt to get bbm fonts working on Travis build.
Fixed a typo and removed redundant test in Travis build.
Added folder containing mktexpk to path for travis build.
Commented out build of Volume 3 to avoid error from missing bbm font.
Merge pull request #639 from insertinterestingnamehere/travis

Implement Travis CI automated builds
Merge branch 'master' into waves