Adding the functions from lab5

- Testing how it's going to look in a markdown format
Force scheme color coding everywhere
MD typo fix
More MD typo fixes ><
Okay, final MD typo fix
Adding 5th homework for lab 2 and 3
Adding tests for homework 5
 Adding grades and solutions to homework4 for lab1.
Adding the example problems solved in on-site labs for group one.
Add exercise 5.
Reordering my files

- All .rkt to .scm
- Adding missing functions in homework3 tests
Merge branch 'master' of https://github.com/gshopov/fp2013 into my-solutions