Extension:Graph/Demo/MapTemplate

params: Optional params:
 * 1) source data (default =  )
 * The data source must contain two columns: 'id' and 'v'
 * type: linear, log, pow, sqrt, quantile, quantize, or threshold
 * colors: list of colors, e.g. ["#F2F2AB","#F1E9A4","#F0E09D",...]
 * width (1 by default)
 * height (1 by default)
 * scale (100 by default)