Add test_queue.py with skeleton test functions for queue.py
Filled in _make_queue() skeleton.
Refactor _make_queue() into _make_empty_queue() and _enqueue() to allow for the use of empty queues
Add queue.py with Queue() and Node() skeletons.
Remove test helper functions to allow for asserts at each step of queue creation; flesh out remaining skeletons
Add linked_list.py to folder for easy importing
Merge branch 'queue' of https://github.com/jefrailey/data-structures into queue
Wrote Queue class, inheriting from the linked_list. Fleshed out the tests.
Added a return value to the dequeue method.
Refactor Queue() to contain LinkedList() instead of sublcassing it to place the user one step further form unneeded methods. Added __str__() to Queue() to print nicely
Add docstrings to Queue().size() and Queue().__str__()