Update build.js to activate all the plugins added in previous commits

Also adds esversion:6 to .jshintrc. This is required by impressConsole.js.

.jshintrc

@@ -5,6 +5,7 @@
 	"boss": true,
 	"browser": true,
 	"curly": true,
+        "esversion": 6,
 	"eqeqeq": true,
 	"eqnull": true,
 	"expr": true,

build.js

@@ -1,18 +1,31 @@
 var buildify = require('buildify');
 
+
 buildify()
   .load('src/impress.js')
   // Libraries from src/lib
   .concat(['src/lib/gc.js'])
   .concat(['src/lib/util.js'])
   // Plugins from src/plugins
-  .concat(['src/plugins/goto/goto.js',
+  .concat(['src/plugins/autoplay/autoplay.js',
+           'src/plugins/blackout/blackout.js',
+           'src/plugins/extras/extras.js',
+           'src/plugins/form/form.js',
+           'src/plugins/goto/goto.js',
+           'src/plugins/help/help.js',
+           'src/plugins/impressConsole/impressConsole.js',
            'src/plugins/mobile/mobile.js',
+           'src/plugins/mouse-timeout/mouse-timeout.js',
            'src/plugins/navigation/navigation.js',
+           'src/plugins/navigation-ui/navigation-ui.js',
+           'src/plugins/progress/progress.js',
            'src/plugins/rel/rel.js',
            'src/plugins/resize/resize.js',
+           'src/plugins/skip/skip.js',
            'src/plugins/stop/stop.js',
-           'src/plugins/touch/touch.js'])
+           'src/plugins/substep/substep.js',
+           'src/plugins/touch/touch.js',
+           'src/plugins/toolbar/toolbar.js'])
   .save('js/impress.js');
 /*
  * Disabled until uglify supports ES6: https://github.com/mishoo/UglifyJS2/issues/448