add rtmpdump wrapper
add support: CBS & thePlatform
update README: CBS support
call legitimize() for bilibili's comment title

if the video title contains invalid filename character, IOError(code=22)
is thrown when saving *.cmt.xml.
Merge branch 'wz520-develop' into develop
letv: fix url parse error
Merge branch 'liuerfire-develop' into develop

Fix #309
Google+: fixed
Acfun: legitimize title
version 0.3.28.3
Travis: add Python 3.4