Maintain Release 1.3.5

Dear all,

As TF r1.0 change a lot, feel free to report bug and pust request.
This update is for TF r1.0 mainly.

This is an incomplete list among the many features added.

• For r1.0
  • update ConcatLayer by @zsdonghao
  • update cross_entropyby qq user 胜势待发
  • update cross_entropy_seq_with_mask by qq user 胜势待发
• Others
  • load and assign a npz model load_and_assign_npz by @zsdonghao
  • update Layer by @zsdonghao
  • hint to use simplified convolutional APIs by @zsdonghao

This version works well under TF 0.10, 0.11 and 0.12 backend, it also works well with TF 1.0 in most of the case, feel free to report if you found a bug. Many thanks!