Ignore the venv directory from the contributing docs.
Merge pull request #1346 from toastdriven/ignore-venv

Ignore the venv directory from the contributing docs.
Merge remote-tracking branch 'upstream/develop' into develop
Added basic unit tests for boto.exception.BotoServerError
Fix typo bug in attach_network_interface.  Some PEP8 docstring cleanup.
Added new root certs to cacerts.txt, to provide additional flexibility in the future
Merge remote-tracking branch 'upstream/develop' into develop