Module 3 - Description
Merge remote-tracking branch 'origin/pre-publishing' into gh-pages
First part of module 4

1. Introduction to lists
2. Introduction to dictionaries
Temp: Remove assignment link
Some proof reading.
Added to module 4: Lists and strings
Assignment 3
Assiignment 3 - updates
Link to assignment
... broken link
Updated description
3 -> 4
Added note about presentation
Remove duplicate exercises
Added examples with lists and random
Examples++
Added Module 4 - Nested lists
Merge remote-tracking branch 'origin/gh-pages' into gh-pages

Conflicts:
	modules/m4/exercises/L04.md
Typo
Added Module 5 - Introductions