toInstnace() binding implementation

> Couldn't find anything like toInstance in GIN, so I've developed one
> myself. Here is the patch against svn revision 135:
> http://ecwid.goldencoinsoft.com/instance-patch.diff

> Usage: declare void methods named like "setXXX" in your ginjector:

> interface MyGinjector extends Ginjector {
>  void setSomething(Something real);
>  void setAnotherThing(@Named("ID") int id);
>  void setAlltogether(Something real, @Named("ID") int id);
>  void setOptional(@Optional Object object);
> }

> Once all non-optional dependencies are set, you can call any other
> ginjector methods. It's that simple.

> I've included some tests which you can use as an example.