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