Added helper for plotting frame matches.
Added helper for plotting frame matches.

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