OpenMDAO/OpenMDAO-Framework — pull request #1476 by naylor-b (2013-11-12 19:55:26+00:00)
Title: changed pyV3D and pyzmq into conditional imports so that non-gui stuff will still work if they fail to install

Also fixed a bunch of places where variable classes were being imported from openmdao.lib.datatypes instead of openmdao.main.datatypes.