Added LCCP algorithm as well as an example.

    fixed error when NO_PRECOMPILE=ON.
    Replaced template specializations in supervoxel_clustering.hpp by declarations.
    Added the template specializations to the cpp file.

    Added \ingroup to supervoxel header.

    Changed default output to XYZL and added the flag -add which will change the output type to <input_type>+L.
    Added flag -bin to save binary output instead of ascii.

    Changed the algorithm to draw the polygon in the example.