Created copy of skills1.py in order to revise using map/filter/reduce instead.
To tests_skills.py: added import line for new skills1_extracredit file. To skills1_extracredit.py: Changed first comment to explain purpose of script.
Removed the import line I just added to test_skills1, because I realized I need a new test file entirely.
Wrote lambda/filter implementation of all_odd, all_even, and long_words functions; all 3 tests passed.
Wrote lambda/reduce implementation of smallest function; test passed.
Wrote lambda/reduce implementation of largest function; test passed.
Wrote lambda/map implementation of halvesies function; test passed.
Wrote lambda/map implementation of word_lengths function; test passed.
Wrote lambda/reduce implementation of sum_numbers function; test passed.
Wrote lambda/reduce implementation of mult_numbers function; test passed.
Wrote lambda/reduce implementation of join_strings function; test passed.
Wrote lambda/reduce implementation of average function; test passed.