Added support for platform-specific manifest overrides

.gitignore

@@ -19,4 +19,5 @@ node_modules
 cache
 build
 tmp/
+test/temp/
 .DS_Store

README.md

@@ -156,6 +156,58 @@ Default value: `null`
 
 WINDOWS ONLY: The path to your ICO icon file. If your don't provide your own it will use the one provided by node-webkit. If you are building on MAC or LINUX you must have [Wine](http://winehq.org) installed to use this option.
 
+### Manifest Options
+
+#### platformOverrides
+
+Allows you to specify platform-specific manifest values. Example manifest:
+
+```json
+{
+    "name": "nw-demo",
+    "version": "0.1.0",
+    "main": "index.html",
+    "window": {
+        "frame": false,
+        "toolbar": false
+    },
+    "platformOverrides": {
+        "win": {
+            "window": {
+                "frame": true
+            }
+        },
+        "osx": {/*
+            ...
+        */},
+        "linux32": {/*
+            ...
+        */},
+        "linux64": {/*
+            ...
+        */},
+    }
+
+```
+
+The platform-specific options will override the others only when building that platform only and the `platformOverrides` property will be removed.
+
+For example, when building for Windows, the manifest generated and put into the end app (from the manifest above) would be:
+
+```json
+{
+    "name": "nw-demo",
+    "version": "0.1.0",
+    "main": "index.html",
+    "window": {
+        "frame": true,
+        "toolbar": false
+    }
+}
+```
+
+See [#85](https://github.com/mllrsohn/node-webkit-builder/issues/85) for more information. If you need this during development too, see [platform-overrides](http://github.com/adam-lynch/platform-overrides) and [gulp-platform-overrides](http://github.com/adam-lynch/gulp-platform-overrides).
+
 
 ## To Do:
 - Test it on Linux and Windows