Completely overhauled how import exclusions work.

Currently new exclusions can only be added when adding new movies or deleting old ones. Not manually in the settings menu.
Movies can now be hidden in the new discover feature by using the new import exclusions!

src/UI/Settings/NetImport/DeleteExclusionCell.js

@@ -0,0 +1,24 @@
+var vent = require('vent');
+var Backgrid = require('backgrid');
+
+module.exports = Backgrid.Cell.extend({
+    className : 'delete-episode-file-cell',
+
+    events : {
+        'click' : '_onClick'
+    },
+
+    render : function() {
+        this.$el.empty();
+        this.$el.html('<i class="icon-sonarr-delete" title="Delete exclusion."></i>');
+
+        return this;
+    },
+
+    _onClick : function() {
+        var self = this;
+
+            this.model.destroy();
+
+    }
+});