Sending JSON packet

I was not able to send the JSON packet from the central hub to the
arduino node. The central hub uses Python XBee api to control the XBee
module. When trying to send the JSON packet using the XBee python's
api, it does not send because it does not accept the '}' character. It
assume that parsing the packet is done but incomplete. So to fix this I
removed the character '}' and '{' (for consistancy) from the JSON
packet. Note that i need to put them back once i retrieve the JSON
packet in the Arduino client node. This testing is in XBeeJson.py file