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.
Removed supervoxel changes from branch, switched to using macro for instantiation
Merge branch 'lccp' of github.com:mschoeler/pcl