Deleted unused class SemaphoreService and SemaphoreException
Removed redundant plaf settings.
Look and feel is now set only once to OS NATIVE look and feel.
Fixed #80.

If you try to save the timeline a save dialog is shown now.
Removed MDB class
Renamed StaticUtilityMethods.java. Added final in Method signature.
Changes message to reflect code.
Database name can now be MAX_DATABASE_NAME_LENGTH long.
Added more restrictions to strings.
Merge pull request #82 from paffman/cleanup

Bugfix and cleanup