Application Kata "Convert roman"

Write a console application that can be used to convert Roman numerals. The following example shows a possible call:

$ convertroman XLII
42
$ convertroman MMXV
2015
$

The number to be copied, either Roman or Arabic, is passed as a command line parameter. The result is displayed on the standard output of the console.

Only Roman numerals in the range from I to MMM need to be taken into account.

Variation #1

The user can specify a text file as a parameter of the command line, as the following example shows:

$ convertroman -f=numbers.txt
XLII
2015
$

Contents of the numbers.txt file in this example:

42
MMXV

Resources

[1] Wikipedia, Roman Numerals, https://en.wikipedia.org/wiki/Roman_numerals