Remove unnecessary return statements

These statements were automatically added by CoffeeScript.

I'm only removing the obvious cases; there might be more cases where the
`return` statement isn't necessary.

app/assets/javascripts/ie_alert.js

@@ -1,4 +1,3 @@
-// Generated by CoffeeScript 1.12.6
 (function() {
   "use strict";
   App.IeAlert = {
@@ -8,11 +7,11 @@
         path: "/",
         expires: 365
       });
-      return $(".ie-callout").remove();
+      $(".ie-callout").remove();
     },
     initialize: function() {
-      return $(".ie-callout-close-js").on("click", function(event) {
-        return App.IeAlert.set_cookie_and_hide(event);
+      $(".ie-callout-close-js").on("click", function(event) {
+        App.IeAlert.set_cookie_and_hide(event);
       });
     }
   };