issue: Conference data Maintenance: The form for maintanance of
conference information.
url: https://github.com/Ivan-Zhukau/conforg-desktop/issues/6
In commit:
1. Introduce initial editor with hardcoded date for conference data
maintenance.
2. Provide common TextField component implementation. Component has
value binding and data converter component.
3. Implement Perpective switcher. Now two perspectives are
available(Conference Managment and Partisipant managment). It's  allowed
to switch between them.
4. Provide simple implementation of View which will display list of
available conferences.
5. Commit Localizable interface for object which have to be translated.
6. Introduce ConferenceService and register it's implementation in
ServiceLocator.

 Issue #6