Changes from Alpha1 version on Beta1 version.

There are two changes from alpha release to beta release about Java according to the ambiguity of VRML2.0 specification.

The argument type of eventIn method.

The argument type of 'eventIn' method was changed to 'Const*' type. Please change the argument type of methods like this:

    Version 2.0 alpha
	public void method (SFTime t, SFTime now)            
    Version 2.0 beta 1:
	public void method (ConstSFTime t, ConstSFTime now)

vs package

Transform, Shape. Kinemation classes are moved to 'vs' package. Please add the following line to use these classes.

        import vs.*;