placed the scipy import into the function to avoid failing tests due to import errors.
placed the scipy import into the function to avoid failing tests due to import errors.

git-svn-id: 1df7fcefc24ce524793a7474bd98e66739d04a42@1475 15d7aa0b-6f1a-0410-991a-d59f85d14984

matthew-brett/pymc,matthew-brett/pymc