Merge pull request #81 from genewoo/master

Move sponsors to YAML instead of markdown.
Merge pull request #82 from genewoo/master

add april weekend call up
增加了报名地址，修改了下关于报名的措辞
把Gitcafe统一成GitCafe，已保持和官网一致，另外为活动地点配上了地图

程序员什么的最注重大小写了。。
从报名地址中移除了 http:// 前缀

只是为了好看而已
RSS update at 04/18/2014 by zhour6
add user dave
Merge pull request #83 from menghuanwd/master

add user dave
g
Merge pull request #84 from jimmy23/master

add user: Jimmy Yan
add may weekday call up
Merge pull request #85 from zhouguangming/master

add may weekday call up
add monthly callup for june
Merge pull request #86 from bachue/master

add monthly callup for june