Address related improvements

- QR code is now shown in contact details and 'manage identity' view
- Contacts and identities can now be deleted

app/src/main/res/menu/address.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright 2016 Christian Basler
+  ~
+  ~ 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.
+  -->
+
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+      xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item
+        android:id="@+id/write_message"
+        android:title="@string/write_message"
+        app:showAsAction="ifRoom"/>
+    <item
+        android:id="@+id/delete"
+        android:title="@string/delete"
+        app:showAsAction="ifRoom"/>
+    <item
+        android:id="@+id/share"
+        android:title="@string/share"
+        app:actionProviderClass="android.support.v7.widget.ShareActionProvider"
+        app:showAsAction="always"/>
+</menu>