Fix build process: conflicting dependencies

* package.json listed grunt ^0.4.5, which conflicts with grunt-nw-builder (requires grunt ^1.0.1).
* Node versions 7 and above deprecated os.tmpDir, which is used in several dependencies such as temp (outdated deps?)
  To patch this, run 'npm install' as usual, then execute the shell script 'patch_tmpdir.sh' in the root of this repo.

package.json

@@ -35,7 +35,7 @@
   "devDependencies": {
     "dateformat": "2.0.0",
     "fs-extra": "3.0.1",
-    "grunt": "^0.4.5",
+    "grunt": "^1.0.0",
     "grunt-casperjs": "^2.2.1",
     "grunt-cli": "^1.3.2",
     "grunt-contrib-clean": "1.1.0",

patch_tmpdir.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+grep -rl "os.tmpDir" node_modules --include \*.js | while read -r file; do
+  
+  sed -i 's/os.tmpDir/os.tmpdir/g' $file
+
+done