Spotty Process: Get all instances in a given availability zone

response.js

// Request using availability zone codes
// curl http://spot.arfon.org/availability_zones/us-east-1b
// Example response below

[{
  "availability_zone": "us-east-1b",
  "current_price": 0.0635,
  "id": "50c070e7884b630002000005",
  "name": "m3.xlarge",
  "pricing_history": {
    "2012-12-06 10:10:15 UTC": "0.063500"
  },
  "product_description": "SUSE Linux"
}, {
  "availability_zone": "us-east-1b",
  "current_price": 0.07,
  "id": "50b196d2a2fc8eef1000004b",
  "name": "m2.xlarge",
  "pricing_history": {
    "2012-11-23 20:04:26 UTC": "0.070000",
    "2012-11-24 20:06:02 UTC": "0.070000",
    "2012-11-25 20:06:27 UTC": "0.070000",
    "2012-11-26 20:09:25 UTC": "0.070000"
  },
  "product_description": "Windows (Amazon VPC)"
}, {
  "availability_zone": "us-east-1b",
  "current_price": 0.07,
  "id": "50b196d5a2fc8eef10000080",
  "name": "m2.xlarge",
  "pricing_history": {
    "2012-11-23 20:04:12 UTC": "0.070000",
    "2012-11-24 20:05:43 UTC": "0.070000",
    "2012-11-25 20:06:08 UTC": "0.070000",
    "2012-11-26 20:09:01 UTC": "0.070000"
  },
  "product_description": "Windows"
}]