SINGA-349 Create layer operations for autograd
SINGA-349 Create layer operations for autograd

1. fix bugs for the new design API

2. add flags for training or evaluation process.

3. add changeable initialization method

apache/incubator-singa,ijingo/incubator-singa,nusdbsystem/incubator-singa,ijingo/incubator-singa,nudles/incubator-singa,kaiping/incubator-singa,kaiping/incubator-singa,nudles/incubator-singa,nusdbsystem/incubator-singa,kaiping/incubator-singa,apache/incubator-singa,apache/incubator-singa,nudles/incubator-singa,nusdbsystem/incubator-singa,ijingo/incubator-singa,nudles/incubator-singa,apache/incubator-singa,kaiping/incubator-singa,nudles/incubator-singa,kaiping/incubator-singa,nusdbsystem/incubator-singa,apache/incubator-singa,ijingo/incubator-singa,nusdbsystem/incubator-singa,ijingo/incubator-singa