Only load the spec data files if you are creating a new workflow, otherwise just deserialize the json.
Removed the stuff about calculaing the version of the spec, as we don't use it.
2. Added a last_updated column to the lookup table
3. The Lookup service now uses the above, and compares it to the actual file date, we can then rebuild the lookup if needed.
4. That 755 migration loads up the models, so when you change the models, the migration starts to fail. Not really sure what to do here, but modify the migration while we are in process.
