Merge pull request #56 from Dick-Lane/master

Minimal change so the "answer" does not contradict the constraint.
Improve look
Remove page reference
small fix at angle 315
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
Ensure answer has nonzero coefficients
Small typo.
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
Change LaTeX tabular to array
New lin alg review.
Small fix.
Small fix.
New linalg problem.
fix odd rounding issue (e.g., seed 1841), clean up display.
Fixed bug 2917
Fix bug 2916
Small addition.
correct wording in problem.
correct text in solution.
Fix bug 2914