Update Node verison to 0.11 and status to 'Beta'

src/node/README.md

 # Node.js gRPC Library
 
 ## Status
-Alpha : Ready for early adopters
+Beta
 
 ## PREREQUISITES
 - `node`: This requires `node` to be installed. If you instead have the `nodejs` executable on Debian, you should install the [`nodejs-legacy`](https://packages.debian.org/sid/nodejs-legacy) package.

src/node/package.json

 {
   "name": "grpc",
-  "version": "0.10.0",
+  "version": "0.11.0",
   "author": "Google Inc.",
   "description": "gRPC Library for Node",
   "homepage": "http://www.grpc.io/",