Generating the example apib files

1. run the tests

cd example
go test ./...

apib files are generated like so:

.
├── foos
│   ├── ...
│   └── foos.apib
└── widgets
    ├── ...
    └── widgets.apib

2. combine the doc files

./scripts/combine.sh

final apib doc file is generated at example/apidoc.apib