python:added fibo.py module

This is how to write a program in python and use it later.

>>> import fibo
>>> fibo.fib(1000)
1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987
>>> fibo.fib2(100)
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]
>>> fibo.fib2(1000)
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987]
>>> fibo.__name__
'fibo'
>>> fib=fibo.fib
>>> fib(500)
1 1 2 3 5 8 13 21 34 55 89 144 233 377