Fix Help String Format for Python 2.6

Hi,

This looked like a useful tool for a problem I was having, so I checked it out. 

My dev server is running Debian, so I only have Python 2.6. It turns out that the format string syntax used in the help strings is not compatible with Python 2.6 (2.6 requires the indices of arguments to be indicated). I fixed this locally, and I thought you might like to fix it in your code in case others have the same problem.

Thanks for this tool!
Brad Reaves