Correct macro example in slide 29.

In the original example infinite recursion will be produced when the macro is called.
Merge pull request #33 from bobeff/11-correct-example

Correct macro example in slide 29.
lecture 05: add `next` and `rest` laziness comparison
lecture 09 and 11: fix typo
Merge pull request #35 from gshopov/09-and-11-typo-fix

lecture 09 and 11: fix typo
Merge pull request #34 from gshopov/05-rest-next-and-laziness

lecture 05: add `next` and `rest` laziness comparison
Lecture 13 - part 1
Lecture 10: Hardcode benchmarks
lecture 14: core.async
lectures 15 and 16
Add lecture 17