[IMP] website snippet new option, gallery

website.snippet: The methods described in javascript will be called automatically from the data-method_name = value on li snippets options. The methods are called in the order relative to children of xml (eg: <li data-method1=value1> ... <li data-method2=value2> ... </ li>, the method1 is then called method2). Methods receive two arguments: type (over, click, reset) and value. data-snippet-id-option becomes data-snippet-id. Several xml options can use the same data-snippet-id.

add a new gallery snippet

convert website_sale to the new option system

addons/website/static/src/xml/website.editor.xml

@@ -203,7 +203,7 @@
                   class="form-inline">
                 <div class="well">
                     <div class="form-group pull-left">
-                        <input type="file" name="upload" accept="image/*" style="position: absolute; opacity: 0; width: 1px; height: 1px;"/>
+                        <input type="file" name="upload" accept="image/*" multiple="multiple" style="position: absolute; opacity: 0; width: 1px; height: 1px;"/>
                         <button type="button" class="btn btn-primary filepicker">Upload an image from your computer</button>
                         <button type="button" class="btn hidden wait" disabled="disabled">Uploading...</button>
                     </div>