Moved to google.golang.org/genproto/googleapis/api/annotations

Fixes #52

vendor/github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway/generator/generator.go

@@ -0,0 +1,13 @@
+// Package generator provides an abstract interface to code generators.
+package generator
+
+import (
+	plugin "github.com/golang/protobuf/protoc-gen-go/plugin"
+	"github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway/descriptor"
+)
+
+// Generator is an abstraction of code generators.
+type Generator interface {
+	// Generate generates output files from input .proto files.
+	Generate(targets []*descriptor.File) ([]*plugin.CodeGeneratorResponse_File, error)
+}