Restore Deque Interface in DoublyLinkedList (#1169)

* Restore deque interface

This reverts commit b627ca6 (#1159).

* Implement DoublyLinkedList.reversed()

Ref: #1154

* Move anonymous inner class to ReversedDoublyLinkedList class

* Block inverts in the reversed view

* Make iterators from reversed view unmodifiable

* Block node modification operations

* Add basic tests for reversed view

* Make iterator impl work with reversed view

* Remove redundant override

* Add more iterator tests

* Avoid using size variable for iterator creation

* Fix incorrect test design

* Make Surefire happier with test discovery

* Add common ancestor for list nodes

* Update Javadoc

* Document exceptions for list nodes

* Reorder methods in AbstractListNode

* Move node value to the AbstractListNode

* Hide internal methods in implementation

* Minimize amount of casting involved with ListNode

* Make ListNode an abstract class

* Adjust setter method visibilities of list nodes

* Test that DoublyLinkedList implements both List and Deque

Ref: #1169 (review)