Modified: python*/runner/sensei.py to fix progress message.

The previous sensei message tells the user they are "{completed}/
{total} lessons away from enlightenment."  This is not a true
statement since your fractional progress is not equal to your
distance from enlightenment.  I have modified the report_progress
function to return a two line string.  The first line reports the
total progress and the second line tells them they are {total-
completed} koans away from enlightenment.

I modified report_progress() in both python2/runner/sensei.py
and python3/runner/sensei.py
![Screen Shot 2013-02-15 at 10 31 09 PM](https://f.cloud.github.com/assets/1326365/163152/7a94ba0a-7802-11e2-96ec-c3ea3574ffef.png)