fixes #213 - documents 'details' object in 'onopen' event
fixes #213 - documents 'details' object in 'onopen' event

crossbario/autobahn-js,crossbario/autobahn-js,oberstet/autobahn-js,oberstet/autobahn-js,tavendo/AutobahnJS,oberstet/autobahn-js,crossbario/autobahn-js,tavendo/AutobahnJS,tavendo/AutobahnJS,oberstet/autobahn-js,crossbario/autobahn-js