Added codeshard class to answer arrays so that they can be attached to
by mathviewer
Merge pull request #70 from goehle/codeshard

Class "codeshard" added to answer rule extension (for MathView).

Looks fine.
Merge branch 'release/2.8' of https://github.com/openwebwork/pg into release/2.8
Add most recent version of compoundProblems macros