Adds remap function to converters.py

[kdschlosser]

maps a int/float within a given range to the value within a new range.

great example is an AVR that uses dB's
min = -80dB
max = 10dB

and you want to convert a percentage (0-100) to the dB for that percentage

from __future__ import print_function
from python_utils.converters import remap

print(remap(46.0, 0.0, 100.0, -80.0, 10.0))

the output is

-38.6

It handles negative and positive integers and floats of any combination. There is handling of the new range being 0 (0 gets returned) and also the old range being 0 (minimum of the new range is returned)

[coveralls]

Coverage remained the same at ?% when pulling 1cd155c on kdschlosser:remap into 6afba59 on WoLpH:develop.

[wolph]

Thanks for the addition. I've made a new release :)