Fix for default text screen.
Merge pull request #11 from wmedvede/master

ResourceAddedEvent was augmented in order to carry the SessionInfo.
Merge pull request #12 from wmedvede/master

ConcurrentChangePopup was generified to AbstractConcurrentChangePopup
BZ-1007928 - File Explorer: allows to open and edit files, changes cannot be saved
upgrading errai to 2.4.1.Final
General purpose customizable YesNoCancelPopup added