vagrant@vagrant-ubuntu-vivid-64:/tmp/trusty/git$ juju charm promulgate -s trusty -v                                                                               
INFO:Running charm proof ... 
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/charmtools/proof.py", line 23, in <module>
    from charms import Charm
  File "/usr/lib/python2.7/dist-packages/charmtools/charms.py", line 12, in <module>
    from launchpadlib.launchpad import Launchpad
  File "/usr/lib/python2.7/dist-packages/launchpadlib/launchpad.py", line 33, in <module>
    from lazr.restfulclient.resource import (
ImportError: No module named restfulclient.resource