Add 4 Map subtypes, 'map' property now 'hasMap' and expects Map values.
Updated schema to use an enumeration for maps.
Examples updated to use an enumeration.
Merge branch 'master' into sdo-map
Fixed JSON-LD markup for enumerated value.
Merge branch 'sdo-multifile' into sdo-map
Added new Map example.
Whitespace.
Merge branch 'sdo-map'
Made version number of schema into a variable. Bumped it to 1.7.
Add 'organizer' property (from Event to Person or Organization), as agreed.