renamed identify_object to object_identifier + started implementing
added message dependencies
test with sum of clouds
Revert "test with sum of clouds"

This reverts commit 7215bb0e9dc211acdefc5981d8c8d803421c2a46.

(Too slow)
downsample cloud in objectFinder for speedup
sort detected positions in object_finder
adapted .gitignore to ignore pcd files
adapted node name in object_identifier
added training_capture node
changed training_capture to discard color information
changed gitignore to ignore whole trainingclouds folder
changed objectFinder to use compute3Dcentroid to compute position of objects
changed object finder to compute orientation of object
implemented first version for object_identifier
allowed .pcd files again to transfer training data to nuc (only small clouds)
added training data
fixed bug in objectFinder
worked on object_identifier
try to align object before identification
tried to optimize object position in objectFinder