Fix issue with finding path to .jshintrc

On Windows 7, this script was climbing the directory tree 2 nodes at a time on its search for my .jshintrc (stored in my home directory under C:\Users\myusername).  If I was in a directory that was nested by an odd number of children, the rc would never get found.
Merge pull request #33 from marrs/patch-1

Fix issue with finding path to .jshintrc