Moved disk space and about to new info tab

New: Disk space visible in the UI under System Info

src/UI/System/Info/DiskSpace/DiskSpaceCollection.js

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+'use strict';
+define(['backbone', 'System/Info/DiskSpace/DiskSpaceModel'],
+function(Backbone, DiskSpaceModel) {
+    return Backbone.Collection.extend({
+        url:window.NzbDrone.ApiRoot +'/diskspace',
+        model: DiskSpaceModel
+    });
+});

src/UI/System/Info/DiskSpace/DiskSpaceLayout.js

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+'use strict';
+define([
+    'vent',
+    'marionette',
+        'backgrid',
+        'System/Info/DiskSpace/DiskSpaceCollection',
+        'Shared/LoadingView',
+        'Cells/FileSizeCell'
+], function (vent,Marionette,Backgrid,DiskSpaceCollection,LoadingView,FileSizeCell) {
+    return Marionette.Layout.extend({
+        template: 'System/Info/DiskSpace/DiskSpaceLayoutTemplate',
+
+        regions: {
+            grid: '#x-grid'
+        },
+        columns:
+            [
+                {
+                    name: 'driveLetter',
+                    label: 'Drive',
+                    cell: 'string'
+                },
+                {
+                    name: 'freeSpace',
+                    label: 'Free Space',
+                    cell: FileSizeCell,
+                    sortable:true
+                },
+                {
+                    name: 'totalSpace',
+                    label: 'Total Space',
+                    cell: FileSizeCell,
+                    sortable:true
+                }
+            ],
+
+        initialize: function () {
+            this.collection = new DiskSpaceCollection();
+            this.listenTo(this.collection, 'sync', this._showTable);
+        },
+        onRender : function() {
+            this.grid.show(new LoadingView());
+        },
+        
+        onShow: function() {
+            this.collection.fetch();
+        },
+        _showTable: function() {
+            this.grid.show(new Backgrid.Grid({
+                row: Backgrid.Row,
+                columns: this.columns,
+                collection: this.collection,
+                className:'table table-hover'
+            }));
+        }
+    });
+});

src/UI/System/Info/DiskSpace/DiskSpaceLayoutTemplate.html

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+<fieldset>
+    <legend>Disk Space</legend>
+
+    <div id="x-grid"/>
+</fieldset>

src/UI/System/Info/DiskSpace/DiskSpaceModel.js

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+'use strict';
+define(['backbone'], function (Backbone) {
+    return Backbone.Model.extend({
+        
+    });
+});