Fix cc freeze

butterfly/static/main.js

@@ -1504,6 +1504,7 @@
                   }
                   this.body.classList.add('stopped');
                   this.stop = true;
+                  return this.send(' \x7f');
                 } else if (this.stop) {
                   return true;
                 }

coffees/term.coffee

@@ -1415,6 +1415,7 @@ class Terminal
                   @t_bell, @t_queue, @t_blink]) while id--
                 @body.classList.add 'stopped'
                 @stop = true
+                return @send ' \x7f'
               else if @stop
                 return true
               @lastcc = t

setup.py

@@ -31,6 +31,7 @@ options = dict(
             'static/fonts/*',
             'static/images/favicon.png',
             'static/main.css',
+            'static/html-sanitizer.js',
             'static/*.min.js',
             'templates/index.html',
             'bin/*',