add gitignore
add crosswords file
add test file for words
add lab 2 material
add tests for clock exercise
add in-class material for day 2
add readme for day 2 homework
add day3 material
message
Merge remote-tracking branch 'upstream/master'

Conflicts:
	day1/words.py
	day1/words_test.py
	day2/clock_test.py
	day2/hamburger.py