Added a Python 3 implementation of the problem from https://tianrunhe.wordpress.com/2012/11/04/merge-k-sorted-lists/
Added a Python 3 implementation of the problem from https://tianrunhe.wordpress.com/2012/11/04/merge-k-sorted-lists/

Naereen/notebooks,Naereen/notebooks,Naereen/notebooks,Naereen/notebooks