Endpoints for GETting motion events by sensor name

#### Get motion for sensor `GET` `/v1/motion_events/{sensor_name}`
Gets detected motion events for the specified sensor.


**Response**

A `HTTP 200 OK` with an array of motion events:

```json
[
  {
    "_id": "5230b76440823cd634000001",
    "sensor_name": "Sensor 1",
    "state": "motion",
    "date_modified" : "2013-09-11T18:46:16.472Z",
    "date_created" : "2013-09-11T18:32:31.147Z"
  },
  {
    "_id": "5230b76440823cd634000001",
    "sensor_name": "Sensor 1",
    "state": "motion",
    "date_modified" : "2013-09-11T16:46:16.472Z",
    "date_created" : "2013-09-11T16:32:31.147Z"
  }
]

```