Adding support for converting and matching in numpy array format

[cyang-kth]

The current version of code needs to call the match_wkt to match a trajectory and in Python it should also first generate the WKT string first.

Conside two functionalities:

• model.match_numpy: match a trajectory from 2d numpy (N,2) xy coordinates
• linestring.xy(): return a 2d numpy mat (N,2) from a linestring.

[cyang-kth]

Feature already implemented. It will be pushed after our next paper is published.