Merge pull request #4 from joshuastray/fb

add appRequest, refactor login
Merge commit '0e09aaadcf429e00a8df37b82b41bc9055b16205' into plugin_fb_4th
Merge pull request #5 from joshuastray/fb

request -> api
Merge branch 'plugin_fb_4th' of https://github.com/wuzhiming/plugin-x into plugin_fb_4th
change Facebook API
change Facebook API
Merge pull request #3 from wuzhiming/plugin_fb_4th

Plugin fb 4th