Update style_config with pre code

doc/style_config

@@ -35,8 +35,18 @@ config.allowedContent = {
             classes: ['*'],
             styles: ['*']
         },
+        code : {
+            attributes: ['*'],
+            classes: ['*'],
+            styles: ['*']
+        },
+		pre : {
+            attributes: ['*'],
+            classes: ['*'],
+            styles: ['*']
+		},
         p : {
-            styles: ['text-align', 'text-indent', 'border-top', 'border-bottom'],
+            styles: ['text-align', 'text-indent', 'border-bottom', 'border-top'],
             classes: ['*']
         },
         strong : {},
@@ -67,4 +77,5 @@ config.allowedContent = {
             attributes: ['*'],
             classes: ['youtube-embed-wrapper'],
             styles: ['*']
-        }    };
+        }
+    };