modify readme examples

.travis.yml

@@ -7,4 +7,5 @@ before_script:
 # whitelist
 branches:
   only:
-    - master
+    - master
+

README.md

@@ -1,11 +1,11 @@
-# nya-bootstrap-select #
+# nya-bootstrap-select
 
 **nya-bootstrap-select 2** is an AngularJS directive set inspired by @silviomoreto 's [bootstrap-select](https://github.com/silviomoreto/bootstrap-select) .  With this directive you can built an **bootstrap-select** with data-binding feature of angularjs. 
 The 2.x version is totally written. while keep the most feature of **bootstrap-select** but no longer depends jquery and bootstrap-select plugin.
 
 Require: angular 1.2+
 
-##Usage##
+##Usage
 
 1. Install
 
@@ -32,9 +32,9 @@ Require: angular 1.2+
 
 **Migrate from 1.x**  If you have used the previous version of this directive. you need to replace the old code in the template.  See the examples below
 
-##Examples##
+##Examples
 
-###Static Options###
+###Static Options
 
 You can use static options which means you can't change the option when the HTML code is ready. Under this usage, you don't use the `nya-bs-option` directive, but you should add `nya-bs-option` class to all the `<li>` element and `value` attribute to let the directive know you option's value.
 
@@ -60,10 +60,10 @@ You can use static options which means you can't change the option when the HTML
 
 If you decide to use static option, you shouldn't change the option any more, otherwise you may need the `nya-bs-option` directive to generate options dynamically.
 
-###Dynamic Options###
+###Dynamic Options
 In this section you'll see several usage of the `nya-bs-option` directive.
 
-####Basic usage####
+####Basic usage
 This is the very basic usage, we have an array of object used to generate options. the `myModel` will be one of the objects in the `options` array.  if you add an `mulitple` attribute to the `nya-bs-select` element.  `myModel` will be array of objects.
 
 ```html
@@ -74,21 +74,21 @@ This is the very basic usage, we have an array of object used to generate option
 </ol>
 ```
 
-####Group By Object Property####
+####Group By Object Property
 Like vanilla `<select>` we can also generate option group with any property in an object. if you `options` is an array of object. like [{name: "alpha", group: "Group 1"}, {name: "beta", group: "Group 2}, {name: "charlie", group: "Group 2"}]. then we can use group by in `nya-bs-option` expression to generate group.
 
 ```html
 <ol class="nya-bs-select" ng-model="myModel">
 	<li nya-bs-option="option in options group by option.group">
-		<span class="group-header">$group</span>
+		<span class="dropdown-header">{{$group}}</span>
 		<a>
 			{{option.name}}
 		</a>
 	</li>
 </ol>
 ```
 
-##TODO##
+##TODO
 
 - data-header support
 - data-container support