A minor fix
Merge pull request #167 from AZaitzeff/knap

A minor fix
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
Merge pull request #171 from byuimpact/develop

Update playground from develop