Feature/Implement function of GenerateChargeSolutions for station_graph

[CodeBear801]

Issue

#143

• This pull need feat: Implement function to calcualte charge cost #204 to be merged first.
• After stationGraph is construct, it could call algorithm in graph to calculate best solution and generate result in solution format
• Record location information on node
• Fix bug in stationGraph during constructing graph, which has expectation in node sequence
• Make unit test work with Dijkstra especially for arrival energy/charging time part. (More unit test will be added later.)

Tasklist

• add function of GenerateChargeSolutions
• add tests
• review

[wangyoucao577]

This PR is too hard to review since most of the changes are same as PR #204. It's too difficult to distinguish the real changes. Would you please merge #204 then rebase master? After that we'll be able to review it easier.

[CodeBear801]

This PR is too hard to review since most of the changes are same as PR #204. It's too difficult to distinguish the real changes. Would you please merge #204 then rebase master? After that we'll be able to review it easier.

Sure, working on that.

[wangyoucao577]

One more thing: it's better to always use rebase instead of merge, which can avoid strange commit like "@CodeBear801
Merge branch 'feature/oasis-integration2-patch5' of https://github.co… …
c21093d
…m/Telenav/osrm-backend into feature/oasis-integration2-patch5"