fix a bug about adding new tag
filter error code in problem report
clean code
modify doc
Merge branch 'master' of https://github.com/dianping/cat
filter database group
clean code
modify the decorator
Merge pull request #673 from youyong205/master

fix some page
Merge pull request #671 from leonindy/master

fix a bug about adding new tag
Merge pull request #672 from jialinsun/master

filter error code in problem report
modify the builder