Corrections to the vectorization lab.
Merge branch 'master' into vector
Applied most of Ryan's suggestions to the vectorization edits.
Removed the section on numpy.where from the vectorization lab.
Added the nearest neighbor lab.
Merge branch 'develop' into NNS
Moved Cholesky to the end of the LU decomoposition lab.
Also fixed a compilation error.
Some cleanup after moving the cholesky lab.
Also fixed the importing of code from an external file.
Merge pull request #170 from insertinterestingnamehere/elemmatr

Moved Cholesky
Updated solutions of LU decomposition lab and Correlation/Covariance lab
to reflect that Cholesky was moved.
Merge pull request #172 from insertinterestingnamehere/elemmatr

Updated solutions to reflect Cholesky move
Merge branch 'master' into vector
Merge pull request #174 from insertinterestingnamehere/vector

Vectorization edits
Fixed the label
Merge pull request #166 from AZaitzeff/NNS

Lab: Nearest Neighbor Search
Merge branch 'develop' of git://github.com/byuimpact/numerical_computing into develop
added missing figures.
Merge pull request #179 from ayr0/PCA

added missing figures.
Added solution to jeff's labs that did not have them
Added givins solutions