Add sqlite3 support in Python3.6

* CUDA kernel for density_prior_box_op.
* Support flatten to 2D.

Bumped MKL-DNN version to 0.17

Update issue templates

Add dlpack support

test=develop

test=develop

* refine cublase
test=develop

* code refine

* refine cublas

* add GEMME_EX

* add enable_cublas_tensor_op_math doc and add cublasCall
test=develop

* fix CublasCall for cuda version
test=develop

* fix error
test=develop

* fix GEMM_EX to be compatible with gcc 4.8
test=develop

* add GEMM_EX
test=develop

* to compatiable with gcc4.8
test=develop

test=develop

* add hdfs utils

* add hdfs utils

* test=develop

* update hdfs utils and add demo

* fix multi_download return local files

* test=develop

* add sync multi upload, test=develop

Add python3.6 python3.7 support to manylinux Dockerfile

Add group normalization operator.

test=develop

fix(Cpu): fix cpu compile and unittest

* add recordio support

* disable the openblas multi-thread on windows since no support
adjust the python script

* code style

* code style
test=develop

* add create_recordio_file_reader back

* fix code style
test=develop

* fix the gtest.cmake on windows

* fix cc_test on windows

* fix the win build
test=develop

* remove fused compile support on windows
test=develop

* add the jit support
test=develop

* add the jit support, test=develop

* add the jit support, test=develop

* add the jit back
fix compile error on windows

* rollback test=develop

* test case fix

* disable DSO by default on windows

* exclude warpctc_op on windows

* exclude the dynload_warpctc out on windows
test=develop

* fix the scripts error
test=develop

* disable avx on windows by default
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* re-organize the cmake file

* disable mkl on windows by default

* add warp_ctc back

* fix the dependency

* fix the dependency

* fix the build issue on windows

* remove unsupported flag on windows

* code style

* code style
test=develop

* fix issue

* add profiler, parallel_executor back

* clean up the pre-definitions on windows

* fix build issue

* test=develop

test=develop

test=develop

change interpolate unittest to serial

Fix compling with cuDNN v5

fix(Compile): fix depends error when compile op using cub

fix mac compile of analysis

test=develop

test=develop

test=develop

Add API example for logical ops and clip ops

fix(Macos): fix compile on macos

Change requirements to support python 3.7

fix avg pool trt bug 

test=develop

some operators depend on cub and xxhash by header. The dependency should be declared explicitly rather than declared to pybind.

test=develop

test=develop

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test=develop

add warm up in TestMultiThreadPrediction

test=develop

fix(Mac): fix unittest of macos