Merge branch 'jackyzy823-develop' into develop, fix #257 and close #266
Youku: fix a regression bug which caused '-y' not work
fix this shit
Bilibili: fix (partly) #376
Bilibili: use a saner UA, as required in #376
Bilibili: add multi-P support, fix #377
use concat demuxer on FFmpeg >= 1.1, fix #324
music.163.com: fetch author name and position of song in album
fix letv error