chapter 2 and beginning of chapter 3
include bug info
comment bug out to not annoy other people
fix isSorted tests and solve typo problem with ex 4
remaining coding work for chapter 3 - but need more work on reasoning about foldRight
chapter 2: add a test of fibonacci for a big number - to see if the stack doesn't blow...
added some handy comments
NM finished chapter 4
Merge pull request #4 from pkelly03/master

updating upstream