Fixes issue with UUID generation in a multi-threaded environment (by turning off use
of the state file used by the uuid gem; see documentation at http://rubydoc.info/gems/uuid/2.3.7/frames
for more details).  Also fixes an issue with the pattern used in the "is_uuid?" helper
method used throughout our RESTful API classes and makes note of another error that was
seen that traced back into the engine class (added a "ToDo" to that class to track the error
and see if it crops up again since we haven't been able to recreate it).  If it doesn't
show up again, perhaps it's related to the issue seen with the UUID gem, above.