Removed flash, renamed file, unbroken logout / login request notifications

Closes #354
* Reintroduced the redirect functionality (not logged in, tries to go to `/settings/user/`, is sent to `/login/` with info notification, after login user is taken to `/settings/user/)
* Reintroduced the "Successfully logged out" message
* Added middleware to scrub passive notifications from `ghost.notifications` after one use basically mimicing client side passive notifications
* Removed flash from everywhere. Even from package.json.
* Renamed flashed.hbs to notifications.hbs, modified default.hbs accordingly
* Added function to parse GET variables on client side

ghost/admin/views/base.js

@@ -99,8 +99,22 @@
             }
 
             return message;
-        }
+        },
 
+        // Getting URL vars
+        getUrlVariables: function () {
+            var vars = [],
+                hash,
+                hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&'),
+                i;
+
+            for (i = 0; i < hashes.length; i += 1) {
+                hash = hashes[i].split('=');
+                vars.push(hash[0]);
+                vars[hash[0]] = hash[1];
+            }
+            return vars;
+        }
     });
 
     /**

ghost/admin/views/login.js

@@ -45,14 +45,16 @@
         submitHandler: function (event) {
             event.preventDefault();
             var email = this.$el.find('.email').val(),
-                password = this.$el.find('.password').val();
+                password = this.$el.find('.password').val(),
+                redirect = this.getUrlVariables().r;
 
             $.ajax({
                 url: '/ghost/login/',
                 type: 'POST',
                 data: {
                     email: email,
-                    password: password
+                    password: password,
+                    redirect: redirect
                 },
                 success: function (msg) {
                     window.location.href = msg.redirect;