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