Fix some typos in lecture 06
Merge pull request #41 from mdimitrova/06-fix-typos

Fix some typos in lecture 06
Fix a syntax error in slide 41
Merge pull request #44 from mignev/05-fix-typo

Fix a syntax error in slide 41
Fix various minor typos/mistakes

Conflicts:
	lectures/06-classes-namespaces-inheritance.slim
Clarify slide about global namespace access
Merge pull request #40 from GeorgeSG/small-fixes

Fix various minor typos/mistakes
Lecture 07
Fix a typo and a grammar mistake in lecture 07
Revert an incorrect grammatical change
Merge pull request #45 from mdimitrova/07-fix-typo-and-grammar

Fix a typo and a grammar mistake in lecture 07
Add a new slide about class methods
Merge pull request #48 from MariaTerzieva/06-add-new-slide-about-class-methods

Add a new slide about class methods
Lecture 08
Fix typos in lecture 08
Merge pull request #49 from dkeranov/08-fix-typos

Fix typos in lecture 08
Change `NoMetorError` to `NoMethodError`
Merge pull request #51 from xswordsx/08-fix-exception-typo

Change `NoMetorError` to `NoMethodError`
Fix the quine in lecture 07

I don't know why we had %r as a modifier there.
The correct one seems to be %p.
Add lecture 09