add geospatial_point_center calc on create and update ops for DataProducts, PlatformSites and InstrumentSites
merge
merge branch 'master' of github.com:ooici/coi-services into geopoint

Conflicts:
	extern/pyon
add geopoint calc to observatory and subsite
Merge pull request #736 from MauriceManning/geopoint

Add geospatial_point_center calc to DataProduct, PlatformSite and InstrumentSite