Javascript solution to Code Kata from Wednesday 14th August, 2013.
Reads the contents of the words file (copy of OS X Lion's /usr/share/dict/words) and computes the shortest chain from "cat" to "dog". To change the start and end words edit the function call at the end of the file.
This is essentially an A* search of the words file. Read the comments in the file for more details!
To run: node codeKata_19.js