finished method HW

I found the first 3 methods to be pretty straight forward. The last 2 I knew what needed to be done in english, but had to use the internet to figure out the best way to do it (resulting in - knowing that the method works, but not understanding some of the code ( ex: in word_hash_count - what does the * represent in count_hash?)). My most_common word method does not solve for tied words.