added some discussion notes
Made changes based on ARG meeting
Finished subsetting exercises
Added explaination for when [ needs dimensions specified
Did quiz and part of Functional Components exercise.
Finished Lexical Scoping exercises
Finished special calls exercises.
Figured out promises, lazy evaluation example.
Added functions file
Added the quiz questions
Finished Functions exercises
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.