added an IE for ex.fm
added test for ex.fm
corrected a typo and added myself to travis notifications.
removed some unnecessary imports
forgot to import json json
Add SinaIE (related #1039): extractor for video.sina.com.cn
Add an extractor for 56.com (related #1039)
Add WeiboIE (closes #1039)

It just embed video from other sites.
Modified the _VALID_URL of Youku to catch embed urls.
TEDIE: fix the title extraction
YoutubeIE: new algo for length 85 (closes #1080), thanks to @patrickslin
WeiboIE: extract the player urls from a json webpage

Also extract a Sina url that doesn't require to follow a redirection.
release 2013.07.19
Merge remote-tracking branch 'yasoob/master'
[exfm] Add IE_* descriptions