Added version 1.0 of sympy. Beginning with this version, sympy requires

the mpmath package. The py-mpmath package is added in this PR to
accommodate that.

var/spack/repos/builtin/packages/py-mpmath/package.py

@@ -0,0 +1,13 @@
+from spack import *
+
+class PyMpmath(Package):
+    """A Python library for arbitrary-precision floating-point arithmetic."""
+    homepage = "http://mpmath.org"
+    url      = "https://pypi.python.org/packages/source/m/mpmath/mpmath-all-0.19.tar.gz"
+
+    version('0.19', 'd1b7e19dd6830d0d7b5e1bc93d46c02c')
+
+    extends('python')
+
+    def install(self, spec, prefix):
+        python('setup.py', 'install', '--prefix=%s' % prefix)