feat(http): add basic http service

This implementation only works in JavaScript, while the Observable transpilation
story gets worked out. Right now, the service just makes a simple request,
and returns an Observable of Response.

Additional functionality will be captured in separate issues.

Fixes #2028

modules/angular2/src/http/static_response.ts

@@ -0,0 +1,47 @@
+import {Response as IResponse, ResponseOptions} from './interfaces';
+import {ResponseTypes} from './enums';
+import {baseResponseOptions} from './base_response_options';
+import {BaseException, isJsObject, isString, global} from 'angular2/src/facade/lang';
+import {Headers} from './headers';
+
+// TODO: make this injectable so baseResponseOptions can be overridden
+export class Response implements IResponse {
+  type: ResponseTypes;
+  ok: boolean;
+  url: string;
+  status: number;
+  statusText: string;
+  bytesLoaded: number;
+  totalBytes: number;
+  headers: Headers;
+  constructor(private body?: string | Object | ArrayBuffer | JSON | FormData | Blob,
+              {status, statusText, headers, type, url}: ResponseOptions = baseResponseOptions) {
+    if (isJsObject(headers)) {
+      headers = new Headers(headers);
+    }
+    this.body = body;
+    this.status = status;
+    this.statusText = statusText;
+    this.headers = <Headers>headers;
+    this.type = type;
+    this.url = url;
+  }
+
+  blob(): Blob {
+    throw new BaseException('"blob()" method not implemented on Response superclass');
+  }
+
+  json(): JSON {
+    if (isJsObject(this.body)) {
+      return <JSON>this.body;
+    } else if (isString(this.body)) {
+      return global.JSON.parse(<string>this.body);
+    }
+  }
+
+  text(): string { return this.body.toString(); }
+
+  arrayBuffer(): ArrayBuffer {
+    throw new BaseException('"arrayBuffer()" method not implemented on Response superclass');
+  }
+}