Number of input columns is published by generated model.
Generated model simplifies mapping from enums to integers.
Generated models improved:

 - sample of data moved into separated class since it was poluting
   constant pool of generated model
 - h2o-model.jar is now published by H2O web server
 - comments about downloading h2o-model.jar
Option to enable scoring after each iteration.
Merge branch 'master' of github.com:0xdata/h2o