Experimenting with making a Linked List for Algorithm.ic.
Resources used:
[Linked Lists and Ruby](http://carlosplusplus.github.io/blog/2013/08/08/linked-lists-and-ruby/)
[Reversing A Linked List in Ruby](http://commandercoriander.net/blog/2012/12/23/reversing-a-linked-list-in-ruby/)

TODO:
[] Fix remove_head (remove the head, but prints all Nodes instead of just the head)
[] Fix remove_tail (prints tail, but doesn't remove tail)
[] Add Reverse! method
[] Add practical examples of manipulating Linked List