Resolves #139 Trigger for automations

lib/entity_widgets/common/flat_service_button.dart

@@ -0,0 +1,40 @@
+part of '../../main.dart';
+
+class FlatServiceButton extends StatelessWidget {
+
+  final String serviceDomain;
+  final String serviceName;
+  final String text;
+  final double fontSize;
+
+  FlatServiceButton({
+    Key key,
+    this.serviceDomain,
+    this.serviceName: "turn_on",
+    @required this.text,
+    this.fontSize: Sizes.stateFontSize
+  }) : super(key: key);
+
+  void _setNewState(Entity entity) {
+    eventBus.fire(new ServiceCallEvent(serviceDomain ?? entity.domain, serviceName, entity.entityId, null));
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final entityModel = EntityModel.of(context);
+    return SizedBox(
+        height: fontSize*2.5,
+        child: FlatButton(
+          onPressed: (() {
+            _setNewState(entityModel.entityWrapper.entity);
+          }),
+          child: Text(
+            text,
+            textAlign: TextAlign.right,
+            style:
+            new TextStyle(fontSize: fontSize, color: Colors.blue),
+          ),
+        )
+    );
+  }
+}