added frequency field to the geosubmit API
reworked the geosubmit schema so that it's a superset of the
geolocate schema
added heading and speed to CellMeasure and WifiMeasure tables
added new fields 'heading' and 'speed' to the submit api
added comments on geosubmit schema
fixed the dummy values for ichnaea.importer for heading and speed
added comments to the ichnaea.importer module
mapped psc, asu, signalStrength and timing advance for geosubmit