Vagrant bug fixes & tweaks

* Added logoutput => true to Exec default, so the output of all commands
  is included in puppet output. Much noisier, but offers much better
  feedback about setup failures.

* Workaround for permission issues in using npm install for kumascript

* Update vendor to catch South 0.8.3 upgrade, to fix a migration failure
Merge pull request #1272 from lmorchard/vagrant-fixes

Vagrant bug fixes & tweaks