Invoke scripts with the sh extension using bash

[yannickperrenet]

Description

This adds more functionality to the scripts, without breaking any of the functionality as bash is a superset of sh.

In case you are looking to test it out. The following does work (without any errors) with the given change, but did not work before:

function sayIt {
    echo "I AM SAYING IT"
}

sayIt

The function keyword is not recognized by sh, the sh equivalent would be:

sayIt() {
    echo "I AM SAYING IT"
}

sayIt