add feedback btn  and js css
Merge remote-tracking branch 'qiniu/master' into add_feedback_btn
add pic
main.css
add gitignore
remove useless code
Merge remote-tracking branch 'qiniu/master' into add_feedback_btn

Conflicts:
	static/js/docs.js
test code / change btn position
Merge remote-tracking branch 'qiniu/master' into add_feedback_btn

Conflicts:
	_layouts/docs.html
将p接口分离成独立文档。
edit css of homepage
Merge pull request #30 from SunLn/update_homepage_css

edit css of homepage
Merge branch 'master' of github.com:qiniu/developer.qiniu.com
补漏：301跳转改为303跳转。
change the link's name to id in sdk md
Typo fixes in concepts section.
Merge pull request #32 from hughlv/master

Typo fixes in concepts section.
Fixed incorrect response format issue.
Misspelling of action.
Merge pull request #33 from hughlv/master

Fixed format of simple response.