sympy/sympy — pull request #1929 by smichr (2013-03-24 23:57:39+00:00)
Title: Mod handles more simplification; geometry gets reflect method

This builds off of my mod branch and does more simplifications of mod (without using nsimplify which is an approximation) and uses this in the reflect method that was added to geometry which allows geometric entities to be reflected across a line.