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 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
Save subtitles using the same code for all the options
Use a dictionary for storing the subtitles

The errors while getting the subtitles are reported as warnings, if no subtitles are found return and empty dict.
YoutubeIE: use the same function for getting the subtitles for the "--write-sub" and "--all-sub" options
YoutubeIE: don't crash when trying to get automatic captions if the videos has standard subtitles.
Don't try to write the subtitles if it's None