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