Fix duplicate icon issue in date picker (#447)

* Fix for Vaadin 7.7.28 and new Jsoup version

* Chnage Safari to use PWA approach, deprecate and inactive application cache manifest functionality as incompatible with modern browsers

* Fix code formatting

* Fix datepicker double icon issue

Author: TatuLund

vaadin-touchkit-agpl/src/main/java/com/vaadin/addon/touchkit/gwt/client/theme/touchkit.css

@@ -1797,6 +1797,10 @@ select.v-select-select::-ms-expand {
 	width:100%;
 }
 
+.v-touchkit-datepicker>input::-webkit-calendar-picker-indicator {
+    background: none !important;
+}
+
 .v-touchkit-datepicker:after,
 .v-select:after {
 	content: fa-icon-chevron-down;