Added a first draft of the lab on the finite volume method by Jared Whitehead. Also revised the  lab on wave phenomena.
Merge branch 'develop' into finite_volume

Merge finite_volume into develop branch
Modified finitevolume.tex
Revising Finite Volume lab
Merge branch 'develop' into finite_volume

Merge branch 'develop' into finite_volume
Modified waveeqn.tex
Added traveling wave material to the waves lab.
Modified Vol4.tex
Merge branch 'develop' into finite_volume

Merge with develop
Added .pdf files for FiniteVolume
Merge pull request #636 from joshualy/finite_volume

Contains revisions on the Wave Phenomena Lab, and also the Finite Volume lab by Jared Whitehead
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