show nested geojson values in the inspector

[burritojustice]

when displaying properties, parse and display the nested values instead of showing [object OBJECT]

e.g.

                       u'gp:id': 23388311,
                       u'iata:code': u'HND',
                       u'icao:code': u'KHND',
                       u'oa:id': u'5627',
                       u'wd:id': u'Q204853',
                       u'wk:page': u'Tokyo_International_Airport'}```