add d4 warm up excercise
update heading
Merge branch 'master' of http://github.com/epoch/wdi_sydney_2_hw
add d4 homework
Merge branch 'master' of http://github.com/epoch/wdi_sydney_2_hw
day 5 lab & homework
update gitignore
Merge branch 'master' of http://github.com/epoch/wdi_sydney_2_hw