Core: New type of user attribute timezone.

User attribute timezone is now in standart of tz database, http://en.wikipedia.org/wiki/List_of_IANA_time_zones.
- file with all the timezones created in dir resources
- method for matching in a file created in impl.Utils
- timzone attribute modul edited, so as it checks the value according to
  the timezones file
- tests modified