I edited the Vol2.tex file to remove compile error

I had had problem compiling the Vol2 file due moving some files around.  This pull should reconcile my fix with the fix on the remote develop branch.
Merge branch 'develop' of git://github.com/byuimpact/numerical_computing into develop

Conflicts:
	Vol2.tex
This is a commit of some sort.
Merge branch 'develop' of git://github.com/byuimpact/numerical_computing into develop

Conflicts:
	Python/StandardLibrary/stdlib.tex
	Vol2.tex
Merge branch 'develop' of git://github.com/byuimpact/numerical_computing into develop
Updated the solutions file for the affine transformations lab.
Merge branch 'develop' of https://github.com/byuimpact/numerical_computing into develop
Merge branch 'develop' of https://github.com/byuimpact/numerical_computing into develop
Merge branch 'develop' of git://github.com/byuimpact/numerical_computing into develop
Made changes to the LU lab.
change listings environment layout

Add new listings environment for source code and interactive code.
Previous style for now is commented out, but will be eventually
deprecated and removed.
fix compile issue with vol2

Incorrect case.
Minor edits as suggested by the students.
Made comments into docstrings in the solutions file for the
Affine Transformations lab.
Merge pull request #334 from abefrandsen/student_edits

Student edits
Naming and spacing updates in leontief lab.
Grammar and spacing edits to leontieff lab.
Merge branch 'master' into leontief
Merge branch 'master' into leontief
Implemented Dr. Jarvis's suggestions for the Leontief lab.