White space and formatting fixes.
Some small changes to our comparison chart for different numerical methods
for PDE's.
A few more small edits to the finite element lab.
Merge branch 'master' into finite_element
Merge branch 'develop' of https://github.com/byuimpact/numerical_computing into finite_element
Corrected a few typos in the finite element lab.
Merge pull request #653 from insertinterestingnamehere/finite_element

Finite Element revisions