remove index img dir
add brand page
add brand page css
update css vs html
update the download html
update the css vs css_sprite.png
width wider
update docs.js for header nav
text change
change to production link
Merge remote-tracking branch 'qiniu/master' into 7454_add_brand_page_in_developer
Merge remote-tracking branch 'qiniu/master' into 7454_add_brand_page_in_developer
Merge pull request #108 from SunLn/7454_add_brand_page_in_developer

7454 add brand page in developer