[ADF-770] upgrade to md-menu (#2060)

* upgrade to md-menu

- upgrade to md-menu
- fix issue with missing icons
- extend demo shell to show icons for actions
- fix issue with border problems in Firefox
- remove commented out samples in demo shell (there's readme for that instead)

* fix unit tests

* fix tests

ng2-components/ng2-alfresco-datatable/src/components/datatable/datatable.component.spec.ts

@@ -17,8 +17,9 @@
 
 import { SimpleChange } from '@angular/core';
 import { async, ComponentFixture, TestBed } from '@angular/core/testing';
-import { MdCheckboxChange, MdCheckboxModule } from '@angular/material';
+import { MdCheckboxChange } from '@angular/material';
 import { CoreModule } from 'ng2-alfresco-core';
+import { MaterialModule } from '../../material.module';
 import {
     DataColumn,
     DataRow,
@@ -40,7 +41,7 @@ describe('DataTable', () => {
         TestBed.configureTestingModule({
             imports: [
                 CoreModule.forRoot(),
-                MdCheckboxModule
+                MaterialModule
             ],
             declarations: [
                 DataTableCellComponent,