Fixes to run functional tests on Windows.
Fixes to run functional tests on Windows.

 * pyrseas/testutils.py (DbMigrateTestCase.invoke): Use os.pathsep
   instead of ':'.  (DbMigrateTestCase.create_yaml): Remove win32
   customization since it duplicates code in invoke.

dvarrazzo/Pyrseas,perseas/Pyrseas,reedstrm/Pyrseas