filter csv data

[reki2000]

To share the same CSV file for some segment-wise charts, It's useful to have a filtering feature:

  "chart": {
    "file_name": "data-1.csv",
    "filter": { "equals": { "year": "2002" } }  <-- this means "only use rows which has a value "2002" at "year" column
  }

otherwise, users should divide a CSV file into segment-wise CSV files. It makes CSV file handing work more messy and error prone.