Adds substainable testing document
Adds link in README
Addition on presenters
Much `set spell`. Thanks, Vim.
Adds examples/clarifications
Adds reference to `spec_requirer`
Typo
Adds thin model example
Adds reference to Mike Pack's article.
Adds stub chaining example
Less strong wording
Fixes typo
Merge pull request #14 from HouseTrip/sustainable-testing

Sustainable testing