Adds meso:wof_id property description and updates the meso README
Adds src:population_date property description and updates the src README
Adds statoids:population_date property description and updates the statoids README
Property descriptions for the older format of these properties(like meso:wof:id) were missing, so this PR simply adds the new property json files and updates README files as needed.
Fixes https://github.com/whosonfirst/whosonfirst-properties/issues/87
meso:wof_idproperty description and updates themesoREADMEsrc:population_dateproperty description and updates thesrcREADMEstatoids:population_dateproperty description and updates thestatoidsREADMEProperty descriptions for the older format of these properties(like
meso:wof:id) were missing, so this PR simply adds the new property json files and updates README files as needed.