borg.py singleton is not really singleton

[nowaman]

borg singleton method is not really singleton,it is just a shared state to all instances of the class,the better way is processing the new method of the class.

[faif]

"Better" is subjective. If you think that singleton is better for your needs feel free to use it. I am still not planning to add it in this repo because I do not want to encourage its usage.

See also: http://code.activestate.com/recipes/66531/