Merge branch 'master' of gitlab.physik.uni-muenchen.de:Nikolai.Hartmann/KerasROOTClassification

* 'master' of gitlab.physik.uni-muenchen.de:Nikolai.Hartmann/KerasROOTClassification:
  (hopefully) correct treatment of class_weight
  little fix
  load and plot before training RNN
  fix write_friend_tree
  evaluate RNN working
  model and training for RNN working
  data structuring for RNN working
  remove validate and plot all from train
  put score evaluation in separate function
  correct quantile range for input plots
  making balanced training more efficient
  starting to develop yield_batch function for RNN
  starting rnn wrapper
  making balanced training more efficient