Merge pull request #135 from jamesthompson/2.10.0

Quotmod fixed & Int -> Long & Array -> List
Merge remote-tracking branch 'james/2.10.0' into topic/polynomials
Add binary operators directly to Term and Polynomial.

This moves much of the polynomial logic into Polynomial itself. It
adds generalized Ring[Polynomial[C]] and EuclideanRing[Polynomial[C]]
instances. And it simplifies a few other things.
Merge pull request #2 from non/topic/polynomials

Topic/polynomials