added some discussion notes
Added functions file
Added the quiz questions
notes on function components
finished base functions exercise
finished function component exercises
lexical scoping notes
lexical scoping exercises
added more notes and exercises
Added more exercises; replacement function not working yet
Added comment about not working function.
Added final reading notes.
Added final exercises.
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
add my partial answers
merge