Case insensitive ranking for dirspec

Created by: fabiopelosin

I think that autojump would be better if it would have a case insensitive ranking. I find shift to be an expensive key for a tool that I use so often.

$ ajutojump --stat | grep -i myapp
0.8:    /Users/banana/.myapp
262.2:  /Users/banana/super/nested/path/MyApp

$ j my__
my__1__/Users/banana/.myapp    my__2__/Users/banana/super/nested/path/MyApp

This behavior confused me as I want to just to type $ j my to cd /Users/banana/super/nested/path/MyApp.