Rename IPageVisitRuleMatchedObserver to IABPageMatchedObserver
Merge branch 'master' of https://github.com/kooboo-jianghao/CMS
Merge branch 'master' of https://github.com/Kooboo/CMS
Add new feature #8: Language detection for A/B test.
Merge branch 'master' of https://github.com/Kooboo/CMS
Make available to change the rule when editing A/B page setting.
Fixed issue #30
Fixed #12
Merge pull request #32 from kooboo-jifeng/master

Merge the A/B test function changes