Set is_mutable so can add_tag() to these.
CQID respects tags set on mappings when deciding what models to create.
Check that no spurious models are created when CQID fails.
Use List::MoreUtils::any as a shortcutting grep.
Merge pull request #40 from tmooney/cqid_respects_tagging

CQID Respects Tagging