Update vision_configuration.py

used different scale for distances(everything was multiplied by 2/sqrt(3)) and corrected a line in documentation.
I think it is simpler but I hope it does not break anything
In case of non even columns it won't work but I think it would not work before either,
because the result of tiling will have even columns
Update vision_configuration.py
Update vision_configuration.py
Update vision_configuration.py

loop independent part moved outside the loop.
if variable in for loop is not used, better use '_'.
eclipse will not give unused variable warning in this case.
e.g for _ in range(5): print 'Hello world'
Merge pull request #7 from kpsychas/patch-3

Update vision_configuration.py