Fix Bug in RandomForestClassifier When Scores are Less than One

[waylonflinn]

There's a bug in the RandomForestClassifier where scores are not accumulated when they are less than one. There are also other related failure cases. The cause is that that the type for the votes variable is an int type instead of float. This one line change fixes the bug. The classScore variable used to retrieve scores from each tree is already correctly typed as float, making it easy to see that this is indeed a bug.