Fixes annoying nil variable to array conversion for aux_groups variable
Bumps version to 0.2.1 for bug fix
Bumped version to 0.3.0
Removes the destroy on fail option
Changes options that are true/false flags to boolean type
Adds an option called "--hostname-style-groups" or "-h" for short.  This will generate node.env.domain as the default security group instead of node_name_env