commented out broken bits
Synced with .Rmd file
Testing md output
Added explaination to lazy evaluation example start.

Merge branch 'master' of https://github.com/scisus/UBCadv-r

Conflicts:
	03_Functions/Functions_Susannah.md
updated promises-lazy evaluation section
test format
test format
test format
test format
test format
update and add start of Ch 4
continuing functions chapter
continuing functions chapter
continuing functions chapter
continuing functions chapter
continuing functions chapter
continuing functions chapter
Enter a date for "Functions"
working on environments chapter
oh, well that was the end of the chapter