Enhance CJSON with JsonSerializable support (#2540)
Issue #2653: updated Markdown Extra Lib to version 1.3
Add html5 form elements
Resolve merge conflicts
resolve merge conflicts
Encoding a JsonSerializable object will now have it's serializable result
encoded by CJSON.
Added a guard to prevent the autoload bug as mentioned by @cebe.
Added unit test.
Merge pull request #2849 from munawer-t/master

Typo fix in PHPDoc
fixed phpdoc tag
fixes #2852
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
[UK][Guide] typos and updates
 [ci skip]
[EN][Guide] typos
 [ci skip]
Merge pull request #2853 from yiiframework-com-ua/uk_docs

[Guide] Updates (EN, UK)
Fix german documentation misspelling
Merge pull request #2858 from kokomoDev/doc

Fix german documentation misspelling
Merge branch 'master' of git://github.com/yiisoft/yii into HEAD