zigzag example from http://mathr.co.uk/blog/2013-02-01_navigating_by_spokes_in_the_ma...
-rw-r--r-- 176 .gitignore
-rw-r--r-- 135 README.md
drwxr-xr-x - doc
drwxr-xr-x - examples
drwxr-xr-x - extra
drwxr-xr-x - src
drwxr-xr-x - test