minor fix: b64decode takes only bytes not str
Merge branch 'nauhygon-develop' into develop (close #404)
Youku: pass bytes rather than str to base64.b64decode() (for compatibility with python <3.3)
Tudou: fix incomplete download
enable merging f4v segments
add *.f4v to .gitignore
update damned README so no one asks the same silly question
Google+: support multiple videos
log.wtf(): exit code defaults to 1
VideoExtractor: replace misleading error message
Youku: handle wrong password error correctly
quick fix for acfun danmaku #408
Merge branch 'jackyzy823-develop' into develop (fix #408)
YouTube: fix regex