Ruby Heaps

• Created when preparing a blog post on heaps (https://medium.com/@j.masland/what-the-bleep-is-a-heap-2b1afc20c167).
• Implements the heap and the closely related priority queue in Ruby.
• Contains a "monkey-patch" to add heap_sort and heap_sort! methods to the Array class (analogous to sort and sort!)
• Not super efficient (due to its implementation in Ruby rather then C) - created for demonstration purposes.
• Includes Rspec tests for several test cases