support for column definitions in html (#1705)

* support for column definitions in html

- provides generic support for html-based column definitions for
datatable-like controls

* html column definitions for Task List component

* html column definitions for Document List component

* update code and documentation

ng2-components/ng2-alfresco-core/src/components/data-column/data-column.component.ts

@@ -0,0 +1,59 @@
+/*!
+ * @license
+ * Copyright 2016 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Component, Input, ContentChild, TemplateRef } from '@angular/core';
+
+@Component({
+    selector: 'data-column',
+    template: ''
+})
+export class DataColumnComponent {
+
+    @Input()
+    key: string;
+
+    @Input()
+    type: string = 'text';
+
+    @Input()
+    format: string;
+
+    @Input()
+    sortable: boolean = true;
+
+    @Input()
+    title: string = '';
+
+    @ContentChild(TemplateRef)
+    template: any;
+
+    /**
+     * Title to be used for screen readers.
+     */
+    @Input('sr-title')
+    srTitle: string;
+
+    @Input('class')
+    cssClass: string;
+
+    ngOnInit() {
+        if (!this.srTitle && this.key === '$thumbnail') {
+            this.srTitle = 'Thumbnail';
+        }
+    }
+
+}