Simplified pcl::Registration::getFitnessScore()

getFitnessScore() is implemented quite complicated. To transform the input,
transformPointCloud() can be used and the point-to-point distance is allready
given by nn_dists[0] returned from nearestKSearch().
Fix hasConverged() for pcl::SampleConsensusInitialAlignment

converged_ was not set, so hasConverged() returned allways false.
Fix bug to allow static library creation
Merge pull request #338 from hdiethelm/fitness_score_fix

Simplified pcl::Registration::getFitnessScore()
Merge pull request #339 from hdiethelm/hasconverged_fix

Fix hasConverged() for pcl::SampleConsensusInitialAlignment
Merge pull request #340 from juagargi/static_lib_fix

Fix bug to allow static library creation