Migrate to JSON network communication

[alnkpa]

An example:

{
    "instruction": 3, // might wanna change this to "wall"
    "id": 52910,
    "turkers": [
        5,
        8
    ],
    "points": [
        {
            "x" : 8502, 
            "y" : 4201
        },
        {
            "x" : -1050, 
            "y" : 2010
        }
    ]
}