message: Expose Sequential as tfe.Sequential to go with the already exposed tfe.Network.
diff: @@ -52,6 +52,7 @@ To use, at program startup, call `tfe.enable_eager_execution()`.
  @@EagerVariableStore
  @@Network
  +@@Sequential
  @@save_network_checkpoint
  @@restore_network_checkpoint
  @@ -76,6 +77,7 @@ from __future__ import print_function
  from tensorflow.contrib.eager.python import metrics
  from tensorflow.contrib.eager.python.datasets import Iterator
  from tensorflow.contrib.eager.python.network import Network
  +from tensorflow.contrib.eager.python.network import Sequential
  from tensorflow.contrib.eager.python.network import save_network_checkpoint
  from tensorflow.contrib.eager.python.network import restore_network_checkpoint
  from tensorflow.contrib.eager.python.saver import get_optimizer_variables
  