Half of interior point lab.
Added the tex file.
Added plotFigs file and solutions file.
More changes to the Interior point lab.
Added figure, added data file, updated solutions file, finished describing
the algorithm, added an application.
updated solutions file.
Merge pull request #427 from abefrandsen/interiorPoint

Interior point I
Some corrections in the quadrature lab solutions.
Fixed another typo in the quadrature solutions.
Merge pull request #460 from insertinterestingnamehere/quad

Quadrature
Merge pull request #459 from insertinterestingnamehere/splines

Updates to the Bézier cuves lab.