Change 14091
-Created Vector class, iterator, and unit test
-Made list iterator a bidirectional iterator when created from a doubly-linked list. (It still has operator-- when created from singly-linked list, but it won't compile if it's used.)
-Changed front() and back() in list classes to Front() and Back()
#review-14083
-Made list iterator a bidirectional iterator when created from a doubly-linked list. (It still has operator-- when created from singly-linked list, but it won't compile if it's used.)
-Changed front() and back() in list classes to Front() and Back()
#review-14083
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