Added radix sort, and added it to README. Implemented tests for radix sort.
Implemented radix sort. Tests for radix sort are passing.
Implemented test for radix sorting strings.
Modified tests to differentiate between radix_sort_int and radix_sort_str.
Updated README to differentiate between radix_sort_int and radix_sort_str.
Fixed averaging of times in the quicksort's demonstration code.
Added explanatory if __name__ == '__main__' block to radix_sort.py.