Fix argument passing to the main function

The new main function now uses numbers instead of characters to select
which function to call, however arguments in the Makefile were still
passed the old style. Also the passed argument has not been properly
converted in order to be used, and some mistakes were were made in the
switch statement causing the wront function to be called. Fix this.
Fix Insertion Sort unit test

Fix the function call in the SortingTest fixture where the wrong array
has been passed to insertionSort, leaving the smaller array for
insertionSort unsorted, causing the unit test to fail.
Merge branch 'master' of https://github.com/p-conrad/fibonacci