Added new layers

Sebastian Nickelsrequested to merge
develop into master
  • Added Embedding Layer
  • Added LSTM and GRU layer, created BaseRNN parent class, added bidirectional parameter
  • Added flatten parameter to FullyConnected layer
  • VariableSymbol now checks if input range is subset of output range
  • Outputs now can be used as inputs
  • Small bug fixes
Edited by Sebastian Nickels

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