first pass at a weibo publishing agent, almost identical to the twitter one

updating weibo agent with app_key/app_secret options to make it work. and some custom code for if the input event comes from twitter to unwrap t.co urls as those are not allowed on weibo

better spec for weibo agent

text edits

changing user_id to uid
initial commit of a weibo user agent
fixes invalid multibyte char
Merge pull request #63 from albertsun/weibo

Weibo agents (WeiboUserAgent, WeiboPublishAgent)