Code folding fix

- reversed the collapsed/expanded icons since they were backwards.
- made the collapsed icon yellow and brighter so folded code is more
noticeable.
- updated folder icons to retina versions

Author: user.email "jim.barraud@gmail.com

Brogrammer.sublime-theme

@@ -236,24 +236,26 @@
 
     {
         "class": "fold_button_control",
-        "layer0.texture": "Theme - Brogrammer/Brogrammer/folder-open.png",
-        "layer0.opacity": 0.25,
+        "layer0.texture": "Theme - Brogrammer/Brogrammer/folder-closed@2x.png",
+        "layer0.opacity": 1,
         "layer0.inner_margin": 0,
         "content_margin": [8,8]
     },
     {
         "class": "fold_button_control",
         "attributes": ["hover"],
-        "layer0.opacity": 0.5
+        "layer0.opacity": 1
     },
     {
         "class": "fold_button_control",
         "attributes": ["expanded"],
-        "layer0.texture": "Theme - Brogrammer/Brogrammer/folder-closed.png"
+        "layer0.texture": "Theme - Brogrammer/Brogrammer/folder-open@2x.png",
+        "layer0.opacity": 0.25
     },
     {
         "class": "fold_button_control",
-        "attributes": ["expanded","hover"]
+        "attributes": ["expanded","hover"],
+        "layer0.opacity": 0.5    
     },
 
 //