Preset: add requireCamelCaseOrUpperCaseIdentifiers to google preset

See
http://google-styleguide.googlecode.com/svn/trunk/javascriptguide.xml?showone=Naming#Naming

> Optional function arguments start with opt_.
> Functions that take a variable number of arguments should
> have the last argument named var_args.

Ref #1900

Author: markelog

presets/google.json

@@ -9,7 +9,10 @@
         "catch"
     ],
     "requireOperatorBeforeLineBreak": true,
-    "requireCamelCaseOrUpperCaseIdentifiers": true,
+    "requireCamelCaseOrUpperCaseIdentifiers": {
+        "allowedPrefixes": ["opt_"],
+        "allExcept": ["var_args"]
+    },
     "maximumLineLength": {
       "value": 80,
       "allExcept": ["comments", "regex"]

test/data/options/preset/google.js

@@ -5,6 +5,11 @@ var opts = nopt({
   version: Boolean
 });
 
+// requireCamelCaseOrUpperCaseIdentifiers
+function test(opt_test) {
+  var var_args = arguments;
+}
+
 // disallowMultipleLineBreaks
 // disallowMultipleVarDecl
 var insight = new Insight({