Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/plugins/iper-medical/campaign/res/js/iper.campaign.metabox.js

@@ -0,0 +1,39 @@
+/**
+ * Created by fabrizio pera on 22/11/16.
+ */
+function initMetabox(){
+    console.log("** initMetabox **");
+
+    var dateFormat = "yy-mm-dd",
+        from = $( "#campaign_start_date" )
+            .datepicker({
+                dateFormat: dateFormat
+            })
+            .on( "change", function() {
+                to.datepicker( "option", "minDate", getDate( this ) );
+            }),
+        to = $( "#campaign_end_date" ).datepicker({
+            dateFormat: dateFormat
+        }).on( "change", function() {
+                from.datepicker( "option", "maxDate", getDate( this ) );
+            });
+
+    function getDate( element ) {
+        var date;
+        try {
+            date = $.datepicker.parseDate( dateFormat, element.value );
+        } catch( error ) {
+            date = null;
+        }
+
+        return date;
+    }
+}
+
+if($ == undefined){
+    window.$ = jQuery.noConflict();
+}
+
+$(function(){
+    initMetabox();
+});