Collect a series of broken files.

[rwest]

To help us figure out if we're doing the right thing. We need a bunch of examples.

[rwest]

For now these are going in https://github.com/comocheng/ChemCheck/tree/master/ChemCheck/media/examples

I have contributed a bunch which have syntax errors etc., from published models.

We should add examples of "bad chemistry". Two more categories:

• can be parsed but fail cantera validation like duplicates that sum to negative rate coefficients
• validate OK, but chemistry is wrong, like super-fast reverse rate coefficients, etc.