chore(README): adds information about nested properties

Closes #229

README.md

@@ -870,7 +870,7 @@ then you use it as a standard decoder like this:
 
 ```javascript
 var Bike = restmod.model('/bikes').mix({
-	createdAt: {decode:'date_parse'}
+	createdAt: {decode: 'date_parse' }
 });
 ```
 
@@ -914,7 +914,7 @@ var Bike = restmod.model('/bikes').mix({
 
 ### Explicit attribute mapping
 
-You can explicitly tell restmod to map a given server attribute to one of the model's attributs:
+You can explicitly tell restmod to map a given server attribute to one of the model's attributes:
 
 ```javascript
 var Bike = restmod.model('/bikes').mix({
@@ -932,6 +932,51 @@ var User = restmod.model('/users').mix({
 });
 ```
 
+### Nested properties
+
+Sometimes you will need to specify behaviour for nested properties, this is done the same ways as with regular properties using the `.` symbol.
+
+Given the following json response:
+
+```json
+{
+	"id": 1,
+	"serialNo": {
+		"issued": '2014-05-05'
+	}
+}
+```
+
+You can add a date decoder for the `issued` property using:
+
+```javascript
+var Bike = restmod.model('/bikes').mix({
+	'serialNo.issued': { decode: 'date_parse' }
+});
+```
+
+If the nested property is inside an array, you can reffer to it using the `[]` symbols.
+
+So if the json response looks like this:
+
+```json
+{
+	"id": 1,
+	"tags": [
+		{ name: 'endurow', weight: 20 },
+		{ name: 'offroad', weight: 5 }
+	]
+}
+```
+
+You can add a mapping for the `weight` property to the `size` property using:
+
+```javascript
+var Bike = restmod.model('/bikes').mix({
+	'tags[].size': { map: 'weight' }
+});
+```
+
 ## Custom methods
 
 A restmod object is composed of three main APIs, the Model static API, the record API and the collection API.