update hubserving

# Conflicts:
#	doc/doc_ch/config.md
#	doc/doc_en/config_en.md

 delete lite,slim, iosdemo and android demo of dyrgaph branch for now

fix predict_det

[Dygraph] Fix printing problem when multi-image prediction

update config

[Dygraph] update readme and polish some docs

[Dygraph] add model list doc, update model link in paddeocr.py and update model size in quick start doc

[Dygraph] update link in doc

[Dygraph] change output path