Small edits to cwrap lab
Merge branch 'master' into cwrap
Merge branch 'master' into cwrap
Merge branch 'master' into cwrap
add new styles

Remove deprecated style.
Added styles for shell input/output.
Experimental Pseudocode environment
create warning environment
change to warn environment
givens spacing fixes.
Redid Givens explanation.
Minor edits as suggested by students.
Changes to Leontieff and QR.
Merge pull request #350 from abefrandsen/temp2

QR edits
Merge branch 'master' into givens
Added pseudocode to givens lab.
Rewrote givens solution and updated corresponding pseudocode.
Made consistend capitalization in Givens lab.
Added givens hessenberg problem.
Added solution to Hessenberg problem.
Also added some useful comments to the Givens lab.
Spacing changes to eigenvalue lab.
Added description and thought questions to the Hessenberg problem in the
Givens lab.