Initial Goa DSL definitions and code generation

.gitignore

design/design.go

design/types.go

gen/health/client.go

gen/health/endpoints.go

gen/health/service.go

gen/http/cli/infohub/cli.go

gen/http/health/client/cli.go

gen/http/health/client/client.go

gen/http/health/client/encode_decode.go

gen/http/health/client/paths.go

gen/http/health/client/types.go

gen/http/health/server/encode_decode.go

gen/http/health/server/paths.go

gen/http/health/server/server.go

gen/http/health/server/types.go

gen/http/infohub/client/cli.go

gen/http/infohub/client/client.go

gen/http/infohub/client/encode_decode.go

gen/http/infohub/client/paths.go