* Updated Vector class to use template.
* Added Listener class.
* Fixed indent spaces to use white spaces instead of tab.
* Updated unit test for Vector class.
* Updated configur script to buile Makefile.ams automatically.
* Updated Vector class to delete the container objects when the weak flag is true.
* Updated Vector:add(), insert(), remove() and indexOf() to check whether the specified value is null.
* Removed close().