Fix parsing of paragraphs, starting with bold text

"*Important:* Text" parsed to a bullet list, instead of a paragraph that
has "Important:" as bold.
Initial version of 03
Small additions
Require clojure.set
Add TODO to fix additional requires
Remove TODO, we will keep the questions elsewhere
Add more things to lecture 03
Update 03-maps-sets-destruct.lecture

Some typos noticed
Merge pull request #4 from mikesg/03-typos

Update 03-maps-sets-destruct.lecture
Малка правописна грешка
Merge pull request #7 from jivko-chobanov/patch-1

Малка правописна грешка
Add some slides for lecture 4
Add lazy-seq slide
s/Кънчо/Рапончо/g
Add two more slides
Add threading operators
Leave the extra functions for next time
Add some changes on lecture 04
Leave lay function functions for the next lecture