Up to date with fast-deep-equal@2.0.1.
* null and object comparison
* new behavior: different functions that are not equal
* new behavior: handle NaN
* Add tests from fast-deep-equal@2.0.1
* Move tests from fast-deep-equal@2.0.1 to separate file
* Add comments to identify fast-deep-equal code
* Add comments to identify custom handling for React
- Refactor the test directory structure.
- Imports the `node` tests into the browser, building with webpack. They are the source of truth.
- Run headless chrome in Travis.
- Run IE9 in Appveyor.
- Use `builder` to parallelize running lint and various tests.
- Fixes#7
