cleaned up qualityprofile response format.

UI/Quality/QualitySizeCollection.js

@@ -2,6 +2,6 @@
 define(['app', 'Quality/QualitySizeModel'], function () {
     NzbDrone.Quality.QualitySizeCollection = Backbone.Collection.extend({
         model: NzbDrone.Quality.QualitySizeModel,
-        url  : NzbDrone.Constants.ApiRoot + '/qualitysizes'
+        url  : NzbDrone.Constants.ApiRoot + '/qualitysize'
     });
 });

UI/Quality/qualityProfileModel.js

@@ -2,16 +2,6 @@
 define(['app'], function () {
     NzbDrone.Quality.QualityProfileModel = Backbone.DeepModel.extend({
 
-        mutators: {
-            allowed: function () {
-                return _.where(this.get('qualities'), { allowed: true });
-            },
-
-            cutoffName: function () {
-                return _.findWhere(this.get('qualities'), { id: this.get('cutoff') }).name;
-            }
-        },
-
         defaults: {
             id    : null,
             name  : '',