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-sympy/package.py

@@ -6,8 +6,10 @@ class PySympy(Package):
     url      = "https://pypi.python.org/packages/source/s/sympy/sympy-0.7.6.tar.gz"
 
     version('0.7.6', '3d04753974306d8a13830008e17babca')
+    version('1.0', '43e797de799f00f9e8fd2307dba9fab1')
 
     extends('python')
+    depends_on('py-mpmath', when='@1.0:')
 
     def install(self, spec, prefix):
         python('setup.py', 'install', '--prefix=%s' % prefix)