Rerendered Icon in iOS 7 and iOS 8 style.

It was rendered with a wrong and useless border before.

Added 3x Version for iPhone 6 Plus.

Signal/Images.xcassets/AppIcon.appiconset/Contents.json

@@ -3,24 +3,43 @@
     {
       "size" : "29x29",
       "idiom" : "iphone",
-      "filename" : "AppIcon29x29@2x.png",
+      "filename" : "Icon-Small.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-Small@2x.png",
       "scale" : "2x"
     },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-Small@3x.png",
+      "scale" : "3x"
+    },
     {
       "size" : "40x40",
       "idiom" : "iphone",
-      "filename" : "AppIcon40x40@2x.png",
+      "filename" : "Icon-Small-40@2x.png",
       "scale" : "2x"
     },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-Small-40@3x.png",
+      "scale" : "3x"
+    },
     {
       "size" : "60x60",
       "idiom" : "iphone",
-      "filename" : "AppIcon60x60@2x.png",
+      "filename" : "Icon-60@2x.png",
       "scale" : "2x"
     },
     {
-      "idiom" : "iphone",
       "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-60@3x.png",
       "scale" : "3x"
     }
   ],