###first program written in Ruby. Mimic UNIX Cal. Project for Nashville Software School
####methods utilized (so far) for unit tests include...
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month_name - able to take integer from intialize argument and match it with the full month name
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days in_month - calculates how many days in each month. accounts for leap years.
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leap_year? - returns true or false depending on whether or not the year is a leap year return
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get_zeller month - calculates the correct month integer for use in zeller's congruence
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get zeller_year - calculates the correct year for zeller's congruence
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month first_day - utilizes zellers to calculate which day the first of the month falls on
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determine first line_spacing - calculates necessary spaces and joins them into a string
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print one month_header - month/year/first week
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print one_month -