Added test functions for stack project
Implement Stack() and Data() in stack.py to pass tests in test_stack.py
wrote tests for parentheticals
got two of the tests to pass
Update parentheticals() to handle inputs with the same number of parens in the wrong order.
added more test cases
Merge branch 'proper-parenthetics' of https://github.com/jefrailey/data-structures into proper-parenthetics
got final test cases working.
abandoned sum method in favor of simpler test
fixed eol
Update test functions with shorter error message and cleaned up formatting
Add tests to test_stack.py to test operations on a stack that holds data with values that evaluate False.
Remove redundant if/else caluse in Data().__init__()
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