[ADF-1434] Theming ADF component (#2228)

* start custom theming adf

* demo shell cleaning

* login mdl cleaning

* uploader mdl cleaning

* prebuilt themes

* theme picker in demo shell

* clean custom colors and mdl

* fix rebase errors

* theming from color style guide

* dev default theme orange purple

* fix color accent inverted in picker

* fix test and add colors classes

* fix tag component theming issues

* fix datatable theming

* add theming guides

demo-shell-ng2/config/webpack.dev.js

@@ -103,6 +103,13 @@ module.exports = webpackMerge(commonConfig, {
                     to: `assets/${lib}/i18n/`
                 }
             })
+        ]),
+        new CopyWebpackPlugin([
+            {
+                context: `../ng2-components/ng2-alfresco-core/prebuilt-themes/`,
+                from: '**/*.css',
+                to: 'prebuilt-themes'
+            }
         ])
     ]
 });