Description of problem:

The aeolus-cli --help identifies the command-line option "list --targetimages" as valid.  However, it does not seem like that command is recognized as valid when used.

Version-Release number of selected component (if applicable):
 * rubygem-aeolus-cli-0.1.0-4.el6.noarch

How reproducible:
 * 100%

Steps to Reproduce:
1. Get a image-id by running
 # aeolus-cli list --images
2. Get a build-id by running 
 # aeolus-cli list --builds $image-id
3. Using build-id, list target images
 # aeolus-cli list --targetimages $target-image
  
Actual results:
# aeolus-cli list --targetimages a15cbf07-3977-49cc-ab1b-b7e96515e410 
Could not find subcommand for list, run `./aeolus-cli --help` for usage instructions

Expected results:

# aeolus-cli list --targetimages a15cbf07-3977-49cc-ab1b-b7e96515e410 
bca6e6c1-9f16-4704-bd12-707c8103ed5b

Additional info: