renamed Application::handle() to handelRequest()

Name make more sense imo as it is not clear what it handles otherwise.
Removed unused method processRequest form console app and also refactored
console Application to be more similar to web Application.
removed unnecessary check
Merge pull request #538 from cebe/handle-request

renamed Application::handle() to handelRequest()
Added doc.
Merge branch 'master' of github.com:yiisoft/yii2
Added XmlResponseFormatter.
Fixes issue #539: Yii2 Csrf protection broken
Fixed test break.
Fixed test break.
Fixed test break.
Added public.