Add modular service description as a dependency
Use modular service description loader
Modularise service description
Split service description models and operations out

Put these in their own files. Eventually they'll get even more modular.
Convert root of service description to YAML
Bump modular service description dependency
Split service description into logical sections
Rename all .json files to .yaml in service description
Convert all JSON in service description to YAML
Remove duplication among *Page models
Merge pull request #40 from bradfeehan/features/modular-service-description

Modularise service description