Update some geometry methods.
Add a public property 'center'. Update the init() method and -(BOOL)containsPoint:(GLKVector3)p method.
Update the - (void)searchTheProjectedPositionOfPerson:(OIMPerson *)person method. Fix the - (BOOL)testTheRoom:(OIMRoom *)room withPerson:(OIMPerson *)person method
Remove time-recording related methods and properties.
Decrease the comparing threshold.
Update the copyWithZone method. Fix the projection bug.
Update the -(void)intersectWithPath:result:point: method.
The grid can be initialized correctly, but the relations need simplify.
Grid init method bug fixed. Simplify can work correctly.
Add -(void)removeAllRelatedGNodeReferences method.
Project update for path-finding test.