Fix formatting and spelling mistakes
Add missing implementations
Add missing examples for using the functions
Amend mistakes in the example usage of any? and map-argument
Adding solutions for homework 5
Adding homework #6 for lab 2 and 3
Quix fixes for homework 6 README.md

- Change list literals with (list)
- Fix few typos
- change L to l in the 3rd task
Merge pull request #2 from gshopov/update-lab5

Update lab5 with the rest of the implementations