Add support for no imageRef parameter, for supporting boot-from-volume
Change test to test the dictionary object, not the json string
Issue #63: Fix bad requests for /auth/tokens API.
Issue #63: Fix bad requests for /v2.0/RAX-AUTH/impersonation-tokens API.
Issue #63: Fix bad requests for add_node_to_load_balancer and add_load_balancer API.
Issue #63: Fix bad requests for create_server API.
Issue #63: Fix lint issues.
Merge pull request #106 from migibert/issue_63

Issue 63
Merge pull request #93 from rackerlabs/empty-image-bfv-support

Add support for no imageRef parameter, for supporting boot-from-volume