added test for apc widget
added language support for validator
removed validator message relative class
added getLanguage method for validator
added test for language method
moved error view to Resource directory
updated view path in error widget
updated zh-CN language file
moved validator to the root widget namespace, so that it cound get the benefit of widget configuration
removed use statment in is widget
moved validator rule class to new namespace: Widget\Validator instead of Widget\Validator\Rule
updated rule validator's namespace statment
updated validator phpdoc