Renamed variables that were Python keywords
Refactored 'halvesies' function with list comprehension
Add dummy test file from which I can implement actual tests for skills1.py
Implemented test for 'all_odd' function (passed)
Implemented test for 'all_even' function (passed)
Implemented test for 'long_words' function (passed)
Implemented test for 'smallest' function (passed)
Implemented test for 'largest' function (passed)
Implemented test for 'halvesies' function (passed)
Implemented test for 'word_lengths' function (passed)
Implemented test for 'sum_numbers' function (passed)
Implemented test for 'join_strings' function (passed)
Implemented test for 'average' function (passed)