sphere-sphere, box-box special implementation. seems the precision is lower than standard GJK. So now is still not used.


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now the user can choose solver for the basic shape distance/collision. 



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The shape collision basic code is finished. Support both collision and distance. can use gjk in libccd or use independent gjk. tested on simple examples. 
remove geometric_shapes_intersect.h/cpp, replace by gjk_libccd.h/cpp and move them to narrowphase folder

Next step is testing the external interface for shape/mesh 



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Add basic code for primitive shape distance by extending the libccd a bit. Correctness is tested on basic benchmarks. The external interface will be provided soon.

One small problem is that the precision seems not very high in some cases (like the error is 0.1 when distance is 30). 




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add kIOS which can handle collision and distance simultaneously. and refactor the collision_func_matrix.cpp


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