Log Message:
Update py-sympy to 1.2

Highlights

   There are many changes in 1.2 (see below). Some of the highlights are
     * Python 3.3 is no longer supported. If you require Python 3.3
       support, use SymPy 1.1.1. See our [518]policy on dropping support
       for major Python versions.
     * Experimental LaTeX parsing with sympy.parsing.latex.parse_latex()
       has been added, based on the latex2sympy project. This requires
       antlr-python-runtime to be installed. [519]#13706
     * The vector module has been improved to support orthogonal
       curvilinear coordinate systems ([520]Szymon Mieszczak's GSoC
       project)
     * New module sympy.integrals.intpoly for integrating uni/bivariate
       polynomials over 2-polytopes. ([521]Arif Ahmed's GSoC project)
     * Improvements to the code generation module. ([522]Bj?rn Dahlgren's
       GSoC project)
     * Improvements to the group theory module. See below for more
       information. ([523]Valeriia Gladkova's GSoC project)
     * New module sympy.discrete for operating on discrete sequences.
       polynomials over 2-polytopes. ([521]Arif Ahmed's GSoC project)
     * Improvements to the code generation module. ([522]Bj?rn Dahlgren's
       GSoC project)
     * Improvements to the group theory module. See below for more
       information. ([523]Valeriia Gladkova's GSoC project)
     * New module sympy.discrete for operating on discrete sequences.
       ([524]Sidhant Nagpal's GSoC project)

Complete release notes at:
https://github.com/sympy/sympy/wiki/release-notes-for-1.2