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fix #42
The issue is caused by GeoJSON structure deference between Multi-Part and not.
The two types of GeoJSON's coordinates is not same structure as following.
multipart: [ [ [lon, lat], [lon, lat], [lon, lat]...], [ [lon, lat], [lon, lat], [lon, lat]...]... ]
singlepart: [ [lon, lat], [lon, lat], [lon, lat]... ]
So, I've fixed to treat two types in same way by wrapping singlepart coordinates with [].