Minor edits as suggested by students.
Changes to Leontieff and QR.
Merge pull request #350 from abefrandsen/temp2

QR edits
Merge branch 'develop' of https://github.com/byuimpact/numerical_computing into develop
Changes to Least Squares lab, including adding a solutions file.
Other minor changes to Householder, including changing 'orthogonal'
back to 'orthonormal'.