Add increase indent pattern for GFM scope

src/app/text-mate-package.coffee

@@ -73,15 +73,27 @@ class TextMatePackage extends Package
 
     scopedProperties
 
+  readObjectFromPath: (path, callback) ->
+    object = null
+    error = null
+    if fs.isObjectPath(path)
+      object = fs.readObject(path)
+    else
+      plist.parseString fs.read(path), (e, data) ->
+        error = e
+        object = data[0]
+    error = throw new Error("Failed to load object at path `#{path}`") unless object
+    callback(error, object)
+
   getTextMatePreferenceObjects: ->
     preferenceObjects = []
     if fs.exists(@preferencesPath)
       for preferencePath in fs.list(@preferencesPath)
-        plist.parseString fs.read(preferencePath), (e, data) =>
+        @readObjectFromPath preferencePath, (e, object) =>
           if e
             console.warn "Failed to parse preference at path '#{preferencePath}'", e.stack
           else
-            preferenceObjects.push(data[0])
+            preferenceObjects.push(object)
     preferenceObjects
 
   propertiesFromTextMateSettings: (textMateSettings) ->