Stack_applications.py

- revString()       reverse a string using Stack                 O(n)
- parChecker()      check simple balanced parentheses            O(n)
- symChecker()      check balanced symbols                       O(n)
- DecimalToBinary() convert decimal numbers to binary numbers    O(n)
- DecimalToBase()   convert decimal numbers to any base numbers  O(n)
- infixToPostfix()  transform infix to postfix expression        O(n)
- postfixEva()      postfix expression evaluation                O(n)