Updated method names for Org CLI.

Updated the names for some of the existing methods of the Org CLI class
to match their corresponding command line naming format. Therefore,
`add_computeresource` became `add_compute_resource` and etc.
More additions to CLI smoke test suite.

Tests now create a Capsule and use it when creating a HostGroup. Also,
host groups are now created by specifying the Puppet environment and
other attributes.
Merge pull request #1070 from omaciel/still-smoking

Still smoking