TFlashMessages added
TFlashMessages return array of messages
TUseSession added.
Add "isComponentExist" method
Add "isComponentExist" check
Refactoring after rename methods in TUseSession
Rename "isComponentExist" => "isRegistered"
Refactoring after rename "isComponentExist" => "isRegistered"
Merge pull request #1 from Ekhvalov/master

TFlashMessages & TUseSession traits added