Prelimnary framework in place
OperationDistance::train finished
Renamed OperationDistance to FuseDistance
Removed unused train parameter
Added ZScore distance
Merge branch 'master' of https://github.com/biometrics/openbr into score_level_fusion
Fixed grammar in comments
Removed split parameter
Merge pull request #148 from biometrics/score_level_fusion

Score level fusion support