Added possibility to extract similarity invariant frame descriptors.
Added possibility to extract similarity invariant frame descriptors.

andersbll/vlbenchmarks,vlfeat/vlbenchmarks,andersbll/vlbenchmarks,CVML/vlbenchmarks,CVML/vlbenchmarks,andersbll/vlbenchmarks,vlfeat/vlbenchmarks,andersbll/vlbenchmarks,vlfeat/vlbenchmarks,CVML/vlbenchmarks