支持SSR、升级Vue版本和增加新的icon (#40)

* search component add new style

* update vue version and support ssr

* unit test

* add new icon

* new icon

test/unit/specs/actionsheet.spec.js

@@ -84,11 +84,11 @@ describe('ActionSheet', () => {
     });
 
     const actionItem = wrapper.find('.van-actionsheet__item')[0];
-    actionItem.simulate('click');
+    actionItem.trigger('click');
     expect(called).to.be.true;
 
     const secondActionItem = wrapper.find('.van-actionsheet__item')[1];
-    secondActionItem.simulate('click');
+    secondActionItem.trigger('click');
   });
 
   it('create actionsheet with cancel button', () => {