    /**
     * @author Ed Spencer
     * @class Ext.data.proxy.LocalStorage
     * @extends Ext.data.proxy.WebStorage
     *
     * <p>The LocalStorageProxy uses the new HTML5 localStorage API to save {@link Ext.data.Model Model} data locally on
     * the client browser. HTML5 localStorage is a key-value store (e.g. cannot save complex objects like JSON), so
     * LocalStorageProxy automatically serializes and deserializes data when saving and retrieving it.</p>
     *
     * <p>localStorage is extremely useful for saving user-specific information without needing to build server-side
     * infrastructure to support it. Let's imagine we're writing a Twitter search application and want to save the user's
     * searches locally so they can easily perform a saved search again later. We'd start by creating a Search model:</p>
     *
    <pre><code>
    Ext.define('Search', {
        fields: ['id', 'query'],
        extend: 'Ext.data.Model',
        proxy: {
            type: 'localstorage',
            id  : 'twitter-Searches'
        }
    });
    </code></pre>
     *
     * <p>Our Search model contains just two fields - id and query - plus a Proxy definition. The only configuration we
     * need to pass to the LocalStorage proxy is an {@link #id}. This is important as it separates the Model data in this
     * Proxy from all others. The localStorage API puts all data into a single shared namespace, so by setting an id we
     * enable LocalStorageProxy to manage the saved Search data.</p>
     *
     * <p>Saving our data into localStorage is easy and would usually be done with a {@link Ext.data.Store Store}:</p>
     *
    <pre><code>
    //our Store automatically picks up the LocalStorageProxy defined on the Search model
    var store = new Ext.data.Store({
        model: "Search"
    });

    //loads any existing Search data from localStorage
    store.load();

    //now add some Searches
    store.add({query: 'Sencha Touch'});
    store.add({query: 'Ext JS'});

    //finally, save our Search data to localStorage
    store.sync();
    </code></pre>
     *
     * <p>The LocalStorageProxy automatically gives our new Searches an id when we call store.sync(). It encodes the Model
     * data and places it into localStorage. We can also save directly to localStorage, bypassing the Store altogether:</p>
     *
    <pre><code>
    var search = Ext.ModelManager.create({query: 'Sencha Animator'}, 'Search');

    //uses the configured LocalStorageProxy to save the new Search to localStorage
    search.save();
    </code></pre>
     *
     * <p><u>Limitations</u></p>
     *
     * <p>If this proxy is used in a browser where local storage is not supported, the constructor will throw an error.
     * A local storage proxy requires a unique ID which is used as a key in which all record data are stored in the
     * local storage object.</p>
     *
     * <p>It's important to supply this unique ID as it cannot be reliably determined otherwise. If no id is provided
     * but the attached store has a storeId, the storeId will be used. If neither option is presented the proxy will
     * throw an error.</p>
     */
    Ext.define('Ext.data.proxy.LocalStorage', {
        extend: 'Ext.data.proxy.WebStorage',
        alias: 'proxy.localstorage',
        alternateClassName: 'Ext.data.LocalStorageProxy',

        //inherit docs
        getStorageObject: function() {
            return window.localStorage;
        }
    });