showing last login date
Merge branch 'master' of github.com:idega/com.idega.core into course_test

* 'master' of github.com:idega/com.idega.core:
  showing last login date
Using generics; discarded Vector in criterias
sorting collections by localized names
New method to get last logins for all users
Merge branch 'master' of github.com:idega/com.idega.core
Changed toString
New method and exception handling
Merge branch 'master' of github.com:idega/com.idega.core into course_test

* 'master' of github.com:idega/com.idega.core:
  Changed toString
  New method to get last logins for all users
  sorting collections by localized names
  Using generics; discarded Vector in criterias