Sugartensor

Bugfixes:
- fix a running mean and variance update rule in batch normal
- fix a gru bug

Features :
- support multiple GPU support
- add regularizer related functions
- add summary on/off context

Bugfixes:
- fix a missed tensorflow 1.0 refactoring at sg_upconv1d()
- fix a missed tensorflow 1.0 refactoring at sg_ctc_loss()

Features :
- support VALID padding at sg_upconv() and sg_upconv1d()
- add zero_out parameter at sg_rnn(), sg_gru() and sg_lstm()

Features :
- scope support at batch normalization

Refactored :
- adapted to tensorflow 1.0.0