Merge pull request #20 from BluntBlade/feature/newdocs

Feature/newdocs
hide turorial menu
Merge remote-tracking branch 'origin/feature/newdocs' into feature/newdocs
Merge pull request #21 from BluntBlade/feature/newdocs

Feature/newdocs
css_sprite  image
top nav dropdown  feature
remove the useless code
Fix
Merge pull request #22 from SunLn/fix2

change in top nav and other
Merge remote-tracking branch 'origin/feature/newdocs' into feature/newdocs
fix resource links,add version
Merge branch 'feature/newdocs' of github.com:icattlecoder/docs.qiniu.com into feature/newdocs
Retitle.