Spacing, line-break, and labeling style fixes in the lab on the spectral
method.
Commented out several parts of the Pseudospectral lab that the students
have already seen earlier on in the lab manuals.
Some small clarifications to the spectral method lab.
make plotting script consistent

Modify the plotting script to conform with the rest of the labs.
comment out old plots

Also clear figure after each plot.
use relative size for figure

Also removed forced positioning.
updated figure
Merge pull request #19 from ayr0/ian_spectral

Modify plots
Merge branch 'master' into spectral
Merge branch 'spectral' of github.com:insertinterestingnamehere/numerical_computing into spectral
Merge branch 'master' into spectral
Merge pull request #600 from insertinterestingnamehere/spectral

Spectral