Second step to making anagrams fast to locate

Add sorted word column to seeds.rb.  Created a chain of methods
to sort each word before inserting it into the database.
Third step to making anagrams easy to access

Updated Word#anagram to use sorted_word field instead
of sorting each word as it was accessed (faster since this field has
an index).
speed up Word#anagram method slightly

Don't run the same operation 230,000 times for the word, just send
the string in to start with.
Final step to making anagrams easy to access

Don't search through the entire database when you have an index
that lets you access the words you are looking for in log(n) time.

Yay pretty one-line methods. :D