is_older function
Number_in_month function + tests
Implementing number_in_months function
Implementing dates_in_month func
Implementing dates_in_months function
Implementing get_nth function
Refactoring
Implementing number_before_reaching_sum fun
Implementing what_month function
Implementing month_range function
Implementing oldest function
Adding challendge problems
Fully implemented
Merge branch 'pl_hw1'