* bs>1 for YOLO

* update doc, test=document_fix
Co-authored-by: NGuanghua Yu <742925032@qq.com>

* s2anet fix export and deploy

* remove redundant code

* fix cpp for s2anet deploy

* fix bug of get_categories

* rename poly_to_rbox to poly2rbox

* add some comment for function

* add inference benchmark

* add ext_op build doc, test=fix_document

* add note for JetPack version with machine

* fix path of script, test=document_fix

* update for ci-travis, test=document_fix

* add benchmark, test=document_fix

* update style of number, test=document_fix

* add difference of dynamic shape and fix shape

* fix paddle inference name problem, and update doc

* set default value

* fix inference lib name in static

* update deploy doc, fix build error of windows

* add annotation of PADDLE_LIB_NAME

* set min_subgraph_size=33 as default, fix bug of fcos_dcn_r50_fpn_1x

* Update install doc and deploy doc.

* fix doc link, test=dygraph, test=document

* update cpp build script

* rename document and update script

* set WITH_MKL=ON for pass CI

* set WITH_GPU=OFF and WITH_TENSORRT=OFF for pass CI

* add TX2 cpp build document and benchmark

* turn WITH_MKL=ON

* add tensorrt version

* set WITH_GPU=OFF for CI

* keep same as TX2_build

* add benchmark on win10 cpp finer, fix bug of _mkdir on windows VS2019 Release bulig

* win cpp use Predictor to inference

* 测试环境描述更加详细

* modify cpp output path

* fix compile error

* modify docs for windows

fix compile error in code
modify code for inference

* deploy code support camera

* fix voc dataset and docs

* add custom datsset demo

* python deploy add log
* deploy add log & benchmark
* Update infer.py

* Add TesnorRT support in cpp deployment
* Change putText style

* fix export_model doc link error

* sort out release/0.3 docs

* add new CHANGELOG

* add yolov4 in changelog