Remove 3x image refs

Author: mattstratton

gulp/tasks/process-html.js

@@ -15,7 +15,7 @@ gulp.task('copy-html', function(){
 })
 
 var retinaOpts = {
-    suffix: {1: '', 2: '@2x', 3: '@3x'}
+    suffix: {1: '', 2: '@2x'}
 };
 
 gulp.task('min-html', function() {

gulp/tasks/responsive-images.js

@@ -136,7 +136,7 @@ gulp.task('responsive-sponsor-images', function() {
 
 gulp.task('responsive-images-remaining', function() {
     return gulp.src(['public/**/*.png', 'public/**/*.jpg','public/**/*.jpeg',
-            '!public/favicon*', '!public/apple-icon*', '!public/android-icon*', '!public/ms-icon*', '!public/**/sharing.jpg', '!**/logo-square.*', '!public/img/sponsor/*.*', '!public/**/organizers/*.jpg','!public/**/speakers/*.jpg','!public/**/organizers/*.png'
+            '!public/favicon*', '!public/apple-icon*', '!public/android-icon*', '!public/ms-icon*', '!public/**/sharing.jpg', '!**/logo-square.*', '!public/img/sponsor/*.*', '!public/**/organizers/*.jpg','!public/**/speakers/*.jpg','!public/**/speakers/*.png','!public/**/organizers/*.png'
         ])
         .pipe(responsive({
             // produce multiple images from one source
@@ -153,10 +153,6 @@ gulp.task('responsive-images-remaining', function() {
                 rename: {
                     suffix: '@2x'
                 }
-            }, {
-                rename: {
-                    suffix: '@3x'
-                }
             }],
             '**/*.jpg': [{
                 width: '100%'