added first pass of TimeDecimalYear class to convert into decimal year notation
added ability to input a decimalyear format date
removed debugging print statement and added check on format for decimalyear. It accepts floats and integers
adding an outline of tests to perform on decimalyear
fixing test on input decimal year to check that it is a float and not a datetime object
all 4 tests passing
Added all of the tests I can think of
fixing test on datetime format that I broke previously