Reset grizzly-manifests for development

As part of cutting the g.2 release, we went through the
usual round of small changes to core.pp and puppet_modules.py
to point them at release code.  This commit reverts them to
point to development code to make developers lives easier
now that the release is out.
Merge pull request #171 from CiscoSystems/return_to_proposed

Reset grizzly-manifests for development