add douyutv support.
fix douyutv support.
fix douyutv support.
fix douyutv title regex
support live.bilibili.com
douyutv.com now can download online flv.
	modified:   common.py
	modified:   extractors/douyutv.py
	modified:   extractors/bilibili.py
Merge branch 'develop' of https://github.com/0x00-pl/you-get into 0x00-pl-develop
Merge commit '8dd3707' into t2