Correct class name so yard can resolve it.
Add parent/child annotation infrastructure. #28.

Includes the instrastructure plus the annotations for MDES 1.2.
All the data specs for the other MDES versions will fail at this
point because they are attempting to load and sanity-check annotations
which are not yet implemented.
A script that tries to determine mother-childness from the MDES spreadsheet. #28.
Manual mappings for all other supported versions. #28.
Merge branch '28-mother_child'