temperatureConverter

Temperature converter

6 kyu link to kata
my solution

Write a function convert_temp(temp, from_scale, to_scale) converting temperature from one scale to another. Return converted temp value.

Round converted temp value to an integer(!).

Reading: http://en.wikipedia.org/wiki/Conversion_of_units_of_temperature

possible scale inputs:
    "C"  for Celsius
    "F"  for Fahrenheit
    "K"  for Kelvin
    "R"  for Rankine
    "De" for Delisle
    "N"  for Newton
    "Re" for Réaumur
    "Ro" for Rømer

temp is a number, from_scale and to_scale are strings.

convert_temp(   100, "C",  "F") # => 212
convert_temp(    40, "Re", "C") # => 50
convert_temp(    60, "De", "F") # => 140
convert_temp(373.15, "K",  "N") # => 33
convert_temp(   666, "K",  "K") # => 666