Four api endpoints

[SiRumCz]

1) This PR add filter function that removes trip data with 0 trip_distance. This filter removed 8000~ data in taxi-sample 2) This completes GH-50.

• /pickup-rush-hours

  New York taxi pick-up rush hours.
  [
  {"time": "00:00", "trips": 34805},
  {...},
  ...
  ]

• /busy-areas

  Number of pickup events for each taxi area in data periods.
  [
  {"areaId": 1, "pickups": 31},
  {...},
  ...
  ]

• /payment-trend-usage

  How many times each payment method has been used during the data period.
  [
  {"paymentId": 1, "paymentType": "Credit card", "totalUsage": 622051},
  {...},
  ...
  ]

• /payment-trend-timeline

  From 2018-12-27 to 2019-09-09 in sample data, how often each payment type has 
  been used.
  [
  {
    "data": [
        {"paymentID": 1, "usage": 123856},
        {...},
        ...
      ],
      "date": "2018-12-27"
  },
  {...},
  ...
  ]

• /average-passenger-counts

  Average passenger counts for New York taxi pick-up areas.
  [
  {"aid": 1, "value": 2.03},
  {...},
  ...
  ]

[soroushysfi]

Great! we can add more Choropleth. like end points, average price,... since we have the map running why not show more data.