Create day model, create spec folder containing spec_helper and day_spec for day model testing
Create @given_date and @num_to_add instance variables, create #given_date_string? to check if passed date is a string, add tests for #given_date_string?
Add #number_an_integer? to check if day is passed an integer for argument, add tests for #number_an_integer?
Create #get_day to return integer for day of given date
Create #get_month to return integer of given month, add test for #get_month
Create #days_in_month to return integer of number of days in a passed month, add test for #days_in_month
Merge pull request #2 from Steveo1485/create-day-model

Create day model