Add metric support (merged commits github.com/calendar42/OpenTripPlanner/: 8165908a3e2e8050948871abce69dcd255db7730 f703f083c9d5d58c05fc739324b9552a8617714a 2628e222e1651dbf219964f647740d96458b5dd6 b5c4cb18173d537762c7c7829c71d10abc289a9c 464d7c80252e2c26e3c797d7eab401f9e157281b b4846355c6a80441af8fa77c438fab1a36303d7e)
Merge pull request #1120 from calendar42/metric-support

leaflet-client: Add metric support
Made test of stop groups more efficient
Add nonpreferred transfer penalty to API
Add unit tests to check the effect of the transfer penalty
Stop polluting the temporary directory with a new graph object each time
the TestRequest test is run