removed extraneous constructor definitions
initialize JSONDataInterface with const string ref
const ref'd all the string funtion parameters, large and small
uuid is now generated upon import of the idf text file, as each JSON object inside an object (not array)  needs a unique identifier.  object_type is now pushed into the object alongside the Fields
Merge branch 'IDFXT' of https://github.com/NREL/EnergyPlusTeam into IDFXT