Use resourceURL() for items in help/

blocks.js

@@ -2559,6 +2559,7 @@ BlockMorph.prototype.restoreInputs = function (oldInputs) {
 
 BlockMorph.prototype.showHelp = function () {
     var myself = this,
+        ide = this.parentThatIsA(IDE_Morph),
         pic = new Image(),
         help,
         comment,
@@ -2596,7 +2597,7 @@ BlockMorph.prototype.showHelp = function () {
             block.fullImage()
         );
     } else {
-        pic.src = 'help/' + spec + '.png';
+        pic.src = ide.resourceURL('help', spec + '.png');
     }
 };
 

gui.js

@@ -2009,6 +2009,7 @@ IDE_Morph.prototype.userMenu = function () {
 
 IDE_Morph.prototype.snapMenu = function () {
     var menu,
+        myself = this,
         world = this.world();
 
     menu = new MenuMorph(this);
@@ -2017,7 +2018,8 @@ IDE_Morph.prototype.snapMenu = function () {
     menu.addItem(
         'Reference manual',
         function () {
-            window.open('help/SnapManual.pdf', 'SnapReferenceManual');
+            var url = myself.resourceURL('help', 'SnapManual.pdf');
+            window.open(url, 'SnapReferenceManual');
         }
     );
     menu.addItem(