package: generate Jami dmg

Change-Id: Ia192ceef98f7c865a1244060ada95c07d9865a28

generateDMG.json

 {
-  "title": "Ring",
+  "title": "Jami",
   "contents": [
-    { "x": 100, "y": 120, "type": "file", "path": "build-local/Ring.app"},
+    { "x": 100, "y": 120, "type": "file", "path": "build-local/Jami.app"},
     { "x": 500, "y": 120, "type": "link", "path": "/Applications" }
   ],
   "window": {