🍎 Install via move instead of copy

This fixes the issue with the icon not showing up on OS X Mavericks
when building.

It seems that copying it to /Application file by file causes the icon to not
show up while moving it atomically there does.

build/package.json

@@ -8,7 +8,6 @@
   "dependencies": {
     "async": "~0.2.9",
     "donna": "1.0.1",
-    "tello": "1.0.3",
     "formidable": "~1.0.14",
     "fs-plus": "2.x",
     "github-releases": "~0.2.0",
@@ -35,6 +34,8 @@
     "request": "~2.27.0",
     "rimraf": "~2.2.2",
     "runas": "~1.0.1",
+    "tello": "1.0.3",
+    "temp": "!0.8.1",
     "underscore-plus": "1.x",
     "unzip": "~0.1.9",
     "vm-compatibility-layer": "~0.1.0"

build/tasks/install-task.coffee

@@ -3,6 +3,7 @@ path = require 'path'
 _ = require 'underscore-plus'
 fs = require 'fs-plus'
 runas = null
+temp = require 'temp'
 
 module.exports = (grunt) ->
   {cp, mkdir, rm} = require('./task-helpers')(grunt)
@@ -22,7 +23,11 @@ module.exports = (grunt) ->
     else if process.platform is 'darwin'
       rm installDir
       mkdir path.dirname(installDir)
-      cp shellAppDir, installDir
+
+      tempFolder = temp.path()
+      mkdir tempFolder
+      cp shellAppDir, tempFolder
+      fs.renameSync(tempFolder, installDir)
     else
       binDir = path.join(installDir, 'bin')
       shareDir = path.join(installDir, 'share', 'atom')