Integrate notebook service with notebook UI (#3143)

Port notebookView code over to notebook.component.ts.
Integrate loading of notebook contents into the UI

src/sql/parts/modelComponents/loadingSpinner.component.ts

@@ -0,0 +1,30 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import 'vs/css!./loadingComponent';
+import {
+	Component, Input, Inject, ChangeDetectorRef, forwardRef, ElementRef
+} from '@angular/core';
+
+import * as nls from 'vs/nls';
+
+@Component({
+	selector: 'loading-spinner',
+	template: `
+		<div class="modelview-loadingComponent-container" *ngIf="loading">
+			<div class="modelview-loadingComponent-spinner" *ngIf="loading" [title]=_loadingTitle #spinnerElement></div>
+		</div>
+	`
+})
+export default class LoadingSpinner {
+	private readonly _loadingTitle = nls.localize('loadingMessage', 'Loading');
+
+	@Input() loading: boolean;
+
+	constructor(
+		@Inject(forwardRef(() => ChangeDetectorRef)) changeRef: ChangeDetectorRef,
+		@Inject(forwardRef(() => ElementRef)) el: ElementRef) {
+	}
+}