Enhance wall_shifts reporting with .json output

Having tracking of the wall shift data in a wall_shifts.json, along side the wall_shifts.csv output would finish off the major data feeds that would make report automation easier.

Here's a model for how I'd like to see the content presented:

// Existing wall_shifts.csv content

Tue Dec 16 16:17:04 EST 2014,coinbase,btc,334.32,USD,0.00299713,0.00298516,{ feed : coinbase - price : 334.32}  { feed : bitcoinaverage - price : 331.23}  { feed : btce - price : 321.959}

Tue Dec 16 16:20:07 EST 2014,coinbase,btc,332.06,USD,0.00301753,0.00300548,{ feed : coinbase - price : 332.06}  { feed : bitcoinaverage - price : 331.12}  { feed : btce - price : 322.769}

Tue Dec 16 16:23:10 EST 2014,coinbase,btc,332.95,USD,0.00300946,0.00299745,{ feed : coinbase - price : 332.95}  { feed : bitcoinaverage - price : 330.58}  { feed : btce - price : 322.9}


// Reimagined wall_shifts.json content

{
  "wall_shifts": [
    {
      "timestamp": 1418764624000,
      "feed": "coinbase",
      "crypto": "btc",
      "price": 334.32,
      "currency": "usd",
      "sellprice": 0.00299713,
      "buyprice": 0.00298516,
      "backupfeeds": [
        { "feed": "bitcoinaverage", "price": 331.23 },
        { "feed": "btce", "price": 321.959 }
      ]
    },
    {
      "timestamp": 1418764807000,
      "feed": "coinbase",
      "crypto": "btc",
      "price": 332.06,
      "currency": "usd",
      "sellprice": 0.00301753,
      "buyprice": 0.00300548,
      "backupfeeds": [
        { "feed": "bitcoinaverage", "price": 331.12 },
        { "feed": "btce", "price": 322.769 }
      ]
    },
    {
      "timestamp": 1418764990000,
      "feed": "coinbase",
      "crypto": "btc",
      "price": 332.95,
      "currency": "usd",
      "sellprice": 0.00300946,
      "buyprice": 0.00299745,
      "backupfeeds": [
        { "feed": "bitcoinaverage", "price": 330.58 },
        { "feed": "btce", "price": 322.9 }
      ]
    }    
  ]

}

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