Merge pull request #54 from BluntBlade/master

添加水印锚点参数表与/rotate参数。
.gitignore
fix the download page style bug (width ： 90% ）
Merge pull request #55 from SunLn/6135_90_percent_width_bug

6135 90 percent width bug
Merge pull request #57 from BluntBlade/master

添加对$(avinfo)的描述和ChagenLog页面。
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Merge pull request #58 from SunLn/6474_add_comment_feature_for_docs

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Merge branch 'master' of github.com:qiniu/developer.qiniu.com
增补同时打多个水印的描述。