set sympy version max at 0.7.3 as 0.7.4 seems to have ufunc wrapping bug
set sympy version max at 0.7.3 as 0.7.4 seems to have ufunc wrapping bug


git-svn-id: 0f58cc6258f6c54be38da79d80706d574b640c9e@720 968178ea-60bd-409e-af13-df8a517b6005

jcfr/mystic,jcfr/mystic