Added documentation for additional fields of Image

Added method, headers and body example for Image component

docs/Images.md

@@ -91,6 +91,22 @@ Many of the images you will display in your app will not be available at compile
 <Image source={{uri: 'https://facebook.github.io/react/img/logo_og.png'}} />
 ```
 
+### Network Requests for Images
+
+If you would like to set such things as the HTTP-Verb, Headers or a Body along with the image request, you may do this by defining these properties on the source object:
+
+```javascript
+<Image source={{
+        uri: 'https://facebook.github.io/react/img/logo_og.png',
+        method: 'POST',
+        headers: {
+          Pragma: 'no-cache'
+        },
+        body: 'Your Body goes here'
+      }}
+       style={{width: 400, height: 400}} />
+```
+
 ## Local Filesystem Images
 
 See [CameraRoll](docs/cameraroll.html) for an example of