+ Initial import of the C implementation for the D* Lite algorithm.

Signed-off-by: swordmaster2k <b00056835@student.itb.ie>
* More work on porting D* Lite.

Signed-off-by: swordmaster2k <b00056835@student.itb.ie>
* D* Lite C implementation now compiling as a Python C module.
+ Added a python tester for D* Lite.

Signed-off-by: swordmaster2k <b00056835@student.itb.ie>