Stop emulating protobuf <-> golang field name conversion

Use the implementation in protoc-gen-go itself

Makefile

@@ -8,8 +8,8 @@ GO_PLUGIN=bin/protoc-gen-go
 GO_PLUGIN_PKG=github.com/golang/protobuf/protoc-gen-go
 SWAGGER_PLUGIN=bin/protoc-gen-swagger
 SWAGGER_PLUGIN_SRC= utilities/doc.go \
-		    utilities/name.go \
 		    utilities/pattern.go \
+		    utilities/trie.go \
 		    protoc-gen-swagger/genswagger/generator.go \
 		    protoc-gen-swagger/genswagger/template.go \
 		    protoc-gen-swagger/main.go

protoc-gen-grpc-gateway/descriptor/types.go

@@ -5,8 +5,8 @@ import (
 	"strings"
 
 	"github.com/gengo/grpc-gateway/protoc-gen-grpc-gateway/httprule"
-	"github.com/gengo/grpc-gateway/utilities"
 	descriptor "github.com/golang/protobuf/protoc-gen-go/descriptor"
+	gogen "github.com/golang/protobuf/protoc-gen-go/generator"
 )
 
 // GoPackage represents a golang package
@@ -235,15 +235,15 @@ type FieldPathComponent struct {
 
 // RHS returns a right-hand-side expression in go for this field.
 func (c FieldPathComponent) RHS() string {
-	return utilities.PascalFromSnake(c.Name)
+	return gogen.CamelCase(c.Name)
 }
 
 // LHS returns a left-hand-side expression in go for this field.
 func (c FieldPathComponent) LHS() string {
 	if c.Target.Message.File.proto2() {
-		return fmt.Sprintf("Get%s()", utilities.PascalFromSnake(c.Name))
+		return fmt.Sprintf("Get%s()", gogen.CamelCase(c.Name))
 	}
-	return utilities.PascalFromSnake(c.Name)
+	return gogen.CamelCase(c.Name)
 }
 
 var (

protoc-gen-grpc-gateway/gengateway/template.go

@@ -114,7 +114,7 @@ var _ codes.Code
 var _ io.Reader
 var _ = runtime.String
 var _ = json.Marshal
-var _ = utilities.PascalFromSnake
+var _ = utilities.NewDoubleArray
 `))
 
 	handlerTemplate = template.Must(template.New("handler").Parse(`