Fixing multiclass logloss bug

[JackStat]

fixes and test that closes #528

[topepo]

Can you change the test to use a model that won't increase package dependencies (e.g. glm or kin)?

[JackStat]

Any ideas on a good multiclass model to use?

[hadjipantelis]

I would think that knn (which has no direct dependencies) should be a good choice. It is fast enough and minimises all dependencies. xTrain is just noise after all; no need to worry for good performance.

[coveralls]

Coverage increased (+1.2%) to 16.018% when pulling dd4d146 on JackStat:master into 3f4e947 on topepo:master.

[coveralls]

Coverage increased (+1.2%) to 16.018% when pulling 6afd32a on JackStat:master into 3f4e947 on topepo:master.

[JackStat]

Probably not the best place to do this but I already had this pull req opened using my master branch. I just noticed that some of the link were broken in the train documentation so I updated them

[coveralls]

Coverage increased (+1.2%) to 16.018% when pulling ada5efd on JackStat:master into 3f4e947 on topepo:master.

[topepo]

Thanks