Update README.md with descriptions of the data structures and improved file structure.
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
Update proper_parenthetics.py

reduced number of iterations over count() method. Reduced number of counters.
Update proper_parenthetics.py

Created more reasonable output for outlying situation.
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__()
Add test_doubly_linked.py with skeleton tests for instantiating expected classes and testing methods.
Add doubly_linked.py with skeletons for expected classes.
Flesh out skeletons for all tests.
Add structure to DoublyLInked() and Node() init methods
Update test_insert() and test_append() to verify the fully built list has the expected head/tail values.
Wrote insert method and revised test slightly to fit new nomenclature.