Merge pull request #22 from PedroChaps/afn478-branch

ex5, ex6; Fixes #5, fixes #6

add lectures 4.1, 4.2, 4.3, 4.4

ga1, ga2, ex1, ex2, ex3; Fixes #9, #10, #12, #13, #14

missing boilerplate for lec4_4

lec3_2; Fixes #5

lec3_1; Fixes #4

lec2; Fixes #3

lec1; Fixes #2

more boilerplate

remove lec4_4

Boilerplate

Merge pull request #1 from PedroChaps/PedroChaps-patch-1

Update README.md

Update README.md