Matt McKay

See Issue #57

- [ ] figure out how to test this with and without solutions (PR #72) - through adjustments to ``conf.py``. Can we introduce a context manager? We will also need...

@jlperla just moved your comments to an individual issue. Thanks for the writeup.

- [ ] [STYLE] `extension` is on the left and `anju` on the right -- do we want the section numbers for the 3rd level? (@jstac) **[Low Priority]**  @AakashGfude...

- [x] [STYLE] `extension` on the left and `anju` on the right. **Decision: For the extension we will keep no `Eq` being added for equations and just show the reference.**...

- [x] fix headings in `coase` lecture

- [x] Issue with `phi` character in code-blocks  fixed by https://github.com/QuantEcon/lecture-source-py/pull/702

- [ ] construct a test case in `tests/`

@DrDrij let's work on this when you are here in September.

thanks @AakashGfude are there still issues with the `tplx`? Can you work through the `travis` build to get his passing CI 1. pin `sphinxcontrib-bibtex==1.0` should fix this. 2. Raise an...