Issue #2653: updated Markdown Extra Lib to version 1.3
Fixed bug in pull request #2687 (I have forgot to commit changes in CMarkdownParser)
Merge branch 'master' of git://github.com/yiisoft/yii into 2653-update-markdown-1.3
#2687 and #2653: Removed the namespaces from Markdown files to support earlier versions of PHP
Merge branch 'master' of git://github.com/yiisoft/yii into 2653-update-markdown-1.3
changelog correction
Merge pull request #2687 from SleepWalker/2653-update-markdown-1.3

Issue #2653: updated Markdown Extra Lib to version 1.3