times nesting in multilines fix

[pnlabs]

Times in nested multiLineStrings are usually nested too (@mapbox/togeojson generates this, for example). It's important to get them in subarrays at each segment.

Example of GeoJSON code needs to be correctly converted:

{
	"type": "FeatureCollection",
	"features": [
		{
			"type": "Feature",
			"properties": {
				"coordTimes": [
					[
						"2015-05-08T06:59:14Z",
						"2015-05-08T07:05:34Z"
					],
					[
						"2015-05-08T07:31:29Z",
						"2015-05-08T07:31:38Z",
						"2015-05-08T07:31:39Z"
					]
				]
			},
			"geometry": {
				"type": "MultiLineString",
				"coordinates": [
					[
						[34.4010477327, 44.6769682411, 13.6],
						[34.3997246493, 44.6748953965, 29.46]
					],
					[
						[34.4003802817, 44.6736188326, 18.88],
						[34.4003147352, 44.6734232828, 23.21],
						[34.4003174175, 44.6734021604, 23.69]
					]
				]
			}
		}
	]
}