Added definitions for expn_code's IKD, MON and LON values based on research from the .CAL documentation. For #1165.
Added definitions for expn_code's IKD, MON and LON values based on research from the .CAL documentation. For #1165.

jsfenfen/django-calaccess-raw-data,california-civic-data-coalition/django-calaccess-raw-data,anthonyjpesce/django-calaccess-raw-data