Implement GET /v1/account/devices

[philbooth]

Request:

curl -v \
-X GET \
-H "Host: api-accounts.dev.lcip.org" \
-H "Content-Type: application/json" \
-H 'Authorization: Hawk id="d4c5b1e3f5791ef83896c27519979b93a45e6d0da34c7509c5632ac35b28b48d", ts="1373391043", nonce="ohQjqb", hash="vBODPWhDhiRWM4tmI9qp+np+3aoqEFzdGuGk0h7bh9w=", mac="LAnpP3P2PXelC6hUoUaHP72nCqY5Iibaa3eeiGBqIIU="' \
https://api-accounts.dev.lcip.org/v1/account/devices

Response:

[
  {
    "id": "0f7aa00356e5416e82b3bef7bc409eef",
    "sessionToken": "27cd4f4a4aa03d7d186a2ec81cbf19d5c8a604713362df9ee15c4f4a4aa03d7d",
    "name": "My Phone",
    "type": "mobile",
    "callback": "https://updates.push.services.mozilla.com/update/abcdef01234567890abcdefabcdef01234567890abcdef",
    "publicKey": "468601214f60f4828b6cd5d51d9d99d212e7c73657978955f0f5a5b7e2fa1370"
  },
  {
    "id": "0f7aa00356e5416e82b3bef7bc409eef",
    "sessionToken": null,
    "name": "My Desktop",
    "type": "desktop",
    "callback": "https://updates.push.services.mozilla.com/update/d4c5b1e3f5791ef83896c27519979b93a45e6d0da34c75",
    "publicKey": "468601214f60f4828b6cd5d51d9d99d212e7c73657978955f0f5a5b7e2fa1370"
  }
]

If the sessionToken field is null, it means the device is disconnected.