rivese/data_structures — pull request #4 by miramzz (2014-06-06 08:56:59+00:00)
Title: final edits for linklist assignments

Elizabeth and I made improvements on the code:
* adding self __str__ method instead of defining a print method.
* Calculating the size at constant time instead of O(n) time
* Added optional next parameter to Node class
* Empty link list checks on insert and pop methods