Expanded the Linesearch lab, generated a couple of figures, included
solutions file and plotfigs file.
A few minor corrections in the LineSearch lab.
Added nonlinear least squares section to lab. Updated solutions and
plotFigs file. Added new figure.
Merge pull request #429 from abefrandsen/newLineSearch

Expanded the Linesearch lab.
This is as much as I'm going to work on it for the time being.