Clear notifications before adding new ones

closes #783

 - I think there's probably a nicer solution than putting clearEverything() everywhere, but that would also probably involve significant refactoring.

init.js

@@ -44,6 +44,7 @@
     };
 
     Ghost.Validate.handleErrors = function () {
+        Ghost.notifications.clearEverything();
         _.each(Ghost.Validate._errors, function (errorObj) {
 
             Ghost.notifications.addItem({

views/base.js

@@ -193,15 +193,7 @@
             this.renderItem(item);
         },
         clearEverything: function () {
-            var height = this.$('.js-notification').outerHeight(true),
-                self = this;
-            this.$el.css({height: height});
-            this.$el.find('.js-notification.notification-passive').fadeOut(250,  function () {
-                $(this).remove();
-                self.$el.slideUp(250, function () {
-                    $(this).show().css({height: "auto"});
-                });
-            });
+            this.$el.find('.js-notification.notification-passive').remove();
         },
         removeItem: function (e) {
             e.preventDefault();

views/editor.js

@@ -120,11 +120,7 @@
             this.savePost({
                 status: keys[newIndex]
             }).then(function () {
-                Ghost.notifications.addItem({
-                    type: 'success',
-                    message: self.notificationMap[status],
-                    status: 'passive'
-                });
+                self.reportSaveSuccess(status);
             }, function (xhr) {
                 // Show a notification about the error
                 self.reportSaveError(xhr, model, status);
@@ -188,11 +184,7 @@
             this.savePost({
                 status: status
             }).then(function () {
-                Ghost.notifications.addItem({
-                    type: 'success',
-                    message: self.notificationMap[status],
-                    status: 'passive'
-                });
+                self.reportSaveSuccess(status);
                 // Refresh publish button and all relevant controls with updated status.
                 self.render();
             }, function (xhr) {
@@ -224,6 +216,15 @@
             return $.Deferred().reject();
         },
 
+        reportSaveSuccess: function (status) {
+            Ghost.notifications.clearEverything();
+            Ghost.notifications.addItem({
+                type: 'success',
+                message: this.notificationMap[status],
+                status: 'passive'
+            });
+        },
+
         reportSaveError: function (response, model, status) {
             var message = this.errorMap[status];
 
@@ -235,6 +236,7 @@
                 message += " " + model.validationError;
             }
 
+            Ghost.notifications.clearEverything();
             Ghost.notifications.addItem({
                 type: 'error',
                 message: message,

views/settings.js

@@ -116,6 +116,7 @@
             });
         },
         saveSuccess: function (model, response, options) {
+            Ghost.notifications.clearEverything();
             // TODO: better messaging here?
             Ghost.notifications.addItem({
                 type: 'success',
@@ -124,6 +125,7 @@
             });
         },
         saveError: function (model, xhr) {
+            Ghost.notifications.clearEverything();
             Ghost.notifications.addItem({
                 type: 'error',
                 message: Ghost.Views.Utils.getRequestErrorMessage(xhr),
@@ -131,6 +133,7 @@
             });
         },
         validationError: function (message) {
+            Ghost.notifications.clearEverything();
             Ghost.notifications.addItem({
                 type: 'error',
                 message: message,