"Leveling"

-Added - Posibility to pass through levels/floors via black tiles
(blankTile). This tile utilize method moveinto which decrease the floor
of player or other entities => added posibility to move items through
floors.
-TempChanged - Default floor for entities is 64.
- Changed - Saving groups and levels. Preventing no attacking entities
after reload and setting level at 0 even if player floor was different.
-Bugfix (Issue #3) - Now entities attack player even  after reload
(saving the group).
-Bugfix(Issue #2) - Move onto BlankTile will not throw Exception (more
info on 1st point)