Adding build system for poetaster typescript node sample

samples/client/petstore/typescript-node/.gitignore

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+/node_modules
+/typings
+/api.js

samples/client/petstore/typescript-node/package.json

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+{
+  "name": "petstore-typescript-node-sample",
+  "version": "1.0.0",
+  "description": "Sample of generated TypeScript petstore client",
+  "main": "api.js",
+  "scripts": {
+    "postinstall": "tsd reinstall",
+    "test": "tsc --module commonjs api.ts typings/tsd.d.ts"
+  },
+  "author": "Mads M. Tandrup",
+  "license": "Apache 2.0",
+  "dependencies": {
+    "bluebird": "^2.9.34",
+    "request": "^2.60.0"
+  },
+  "devDependencies": {
+    "tsd": "^0.6.3"
+  }
+}

samples/client/petstore/typescript-node/tsd.json

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+{
+  "version": "v4",
+  "repo": "borisyankov/DefinitelyTyped",
+  "ref": "master",
+  "path": "typings",
+  "bundle": "typings/tsd.d.ts",
+  "installed": {
+    "bluebird/bluebird.d.ts": {
+      "commit": "f6c8ca47193fb67947944a3170912672ac3e908e"
+    },
+    "request/request.d.ts": {
+      "commit": "2cc4331067a81e2ae6bc4590e7b33bf286c8f28f"
+    },
+    "form-data/form-data.d.ts": {
+      "commit": "2cc4331067a81e2ae6bc4590e7b33bf286c8f28f"
+    },
+    "node/node.d.ts": {
+      "commit": "48b4cb54af76f02b33dccaa0fdd2ae97db7cdd1b"
+    }
+  }
+}