- Started work on image avatars (only Contact Activity done so far).

- Do not allow " character in contact's name, since it can be used as
  SIP diaplay name.

app/src/main/res/layout/activity_contact.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-    xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:id="@+id/ContactView"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
@@ -8,21 +8,40 @@
     android:paddingRight="16dp"
     android:paddingTop="16dp"
     android:paddingBottom="24dp"
-    android:orientation="vertical" >
+    android:orientation="vertical">
 
     <TextView
         android:id="@+id/Avatar"
+        android:layout_width="96dp"
+        android:layout_height="96dp"
+        android:layout_gravity="center_horizontal"
         android:scaleType="centerInside"
         android:background="@drawable/circle"
-        android:layout_width="36dp"
-        android:layout_height="36dp"
-        android:textSize="24sp"
+        android:textSize="72sp"
         android:textStyle="bold"
         android:textAllCaps="true"
         android:textColor="@android:color/white"
         android:gravity="center" >
     </TextView>
 
+    <android.support.v7.widget.CardView
+        android:id="@+id/CardAvatar"
+        android:layout_width="96dp"
+        android:layout_height="96dp"
+        android:layout_gravity="center_horizontal"
+        android:elevation="12dp"
+        app:cardCornerRadius="48dp" >
+
+        <ImageView
+            android:id="@+id/ImageAvatar"
+            android:layout_height="90dp"
+            android:layout_width="96dp"
+            android:adjustViewBounds="true"
+            android:scaleType="centerCrop" >
+        </ImageView>
+
+    </android.support.v7.widget.CardView>
+
     <TextView
         android:id="@+id/NameTitle"
         android:layout_width="wrap_content"