New: gRPC MVC features, new WithLowercaseRouting option and add some new context methods

read HISTORY.md


Former-commit-id: 30a16cceb11f754aa32923058abeda1e736350e7

_examples/mvc/grpc-compatible/README.md

@@ -0,0 +1,20 @@
+# gRPC Iris Example
+
+## Generate TLS Keys
+
+```sh
+$ openssl genrsa -out server.key 2048
+$ openssl req -new -x509 -sha256 -key server.key -out server.crt -days 3650
+```
+
+## Install the protoc Go plugin
+
+```sh
+$ go get -u github.com/golang/protobuf/protoc-gen-go
+```
+
+## Generate proto
+
+```sh
+$ protoc -I helloworld/ helloworld/helloworld.proto --go_out=plugins=grpc:helloworld
+```