2.50.04: Reference fields for assemblies; A5.2 data by fuel use

This is minor release improving the schema for interiors and adding a new way to send construction activities data to the API.
Additionally, we expand our support for A5.2 (construction activity) emissions tracking by allowing users to enter data by fuel type. 
Addition of reference_id
 for interiors data
This release adds a reference_id
 field to assembly-level calculations. The purpose of this field is to allow API users (at least one in particular 😉) to better connect request and response objects without indexing. 
Construction Activities (A5.2) emissions tracking
This update allows API users to calculate construction activities emissions through a calcuation of fuel use on the building site. The fuel types that C.Scale accepts are:
Gasoline
Diesel
Natural gas
Propane
Kerosene
C.Scale accepts a list of "fuel receipts" to the A5p2_emissions
 key which describe how much fuel is used, when it is used, and (optionally) by whom. 