* remove net op and cond_op

* fix cpplint

* fix dependency

* delete backward_test; fix compile

* disable batch_norm backward

* rm test_net.py

* make batchnorm test independent of backward.cc

* make test_layer_norm_op independent of backward.cc

* make test_layer_norm_op independent of backward.cc

* delete unused code

* clean up

* Fix cpplint errors, round2

* Fix pointer issue

* fix gemm error for cuda 7.5

* fix version number

* add cuda_device_functions.h

* move reduceSum to elementwise_op_function.h

1. Removes MultipleReader's multi-thread support, for we have got
ThreadedReader.
2. Rename MultipleReader to MultiFileReader

* initial commit

* fix error

* fix typo and order

* change from hgemm to gemmEx

* fix cpplint