Now pwn_g2o_loop_closer show all the verteces in the trajectory.
Now the pwn clouds before to be saved they are voxelized.
First nice loop closure version.
Merge branch 'master' of https://github.com/grisetti/g2o_frontend

Conflicts:
	g2o_frontend/pwn_g2o/pwn_g2o_loop_closer.cpp