message: adds license and source info of pseudo_inversion.h
diff: // Author: Enrico Corvaglia
  +// https://github.com/CentroEPiaggio/kuka-lwr/blob/master/lwr_controllers/include/utils/pseudo_inversion.h
  +// File provided under the Unilicense
  // pseudo_inverse() computes the pseudo inverse of matrix M_ using SVD decomposition (can choose
  // between damped and not)
  // returns the pseudo inverted matrix M_pinv_
  