* elementwise_add with bcast: Brian's implementation by Brian added, with default bcasts
* elementwise_add with bcast: GetExpectedKernelType added to elementwise_op
* elementwise_add with bcast: use_mkldnn attribute added
* elementwise_add with bcast: changes after review and some formatting
* elementwise_add with bcast: changes after style check
* elementwise_add with bcast: changes after style check cont.
* elementwise_add with bcast: MKLDNN unittests added
* elementwise_add with bcast: original unittests with use_mkldnn flag
* elementwise_add with bcast: handling of MKLDNN format corrected
* elementwise_add with bcast: setting MKLDNN format turned into lambda
* elementwise_add with bcast: MKDNN format setting turned into separate function
* elementwise_add with bcast: condition for choosing MKLDNN simplified
* elementwise_add with bcast: fix for MKLDNN format set incorrectly in bcasts
* elementwise_add with bcast: changes in unittests for broadcasts
* elementwise_add with bcast: fixes in unittests regarding dimensions
* elementwise_add with bcast: bring back correct format setting in mklml grad path
* elementwise_add with bcast: fixed compilation error
* 1. Remove PYTHON_FLAGS from paddle_build.sh in paddlepaddle/paddle:latest-dev
* 1. Add PYTHON_FLAGS back
2. Change SIGKILL to SIGINT and SIGTERM
* 1. Add setup.py.in back
* 1. add pip install open-cv in Dockerfile to avoid libusb_exit hanging up which is caused by the opencv-python package missing
* 1. Add the && \ to line above
* 1. Remove the notice comment
1. Add a new attribute named 'startuo_seed' to RandomCropOp. If the input
'Seed' is not initialized, the 'startup_seed' will be used to replace
it.
2. Refine CustomReader. Add a member variable 'scope_' to it. The
'scope_' will act as the global scope of preprocesing, making it
possiable to save something cross batches.