made a slight simplification to size method in arraylist
Merge branch 'master' of https://github.com/BBK-PiJ-2014-88/cw3
changed fields to private in Node and changed few methods in LinkedList so those fields in Node can only be accessed with getters and setters
changed fields to private in Node and changed few methods in LinkedList so those fields in Node can only be accessed with getters and setters