List punctuation in default theme, don't set color for default color styles

Also fix Erlang mode to not return a non-standard token type.

Issue #2435

Author: marijnh

lib/codemirror.css

@@ -72,11 +72,12 @@
 .cm-s-default .cm-atom {color: #219;}
 .cm-s-default .cm-number {color: #164;}
 .cm-s-default .cm-def {color: #00f;}
-.cm-s-default .cm-variable {color: black;}
+.cm-s-default .cm-variable,
+.cm-s-default .cm-punctuation,
+.cm-s-default .cm-property,
+.cm-s-default .cm-operator {}
 .cm-s-default .cm-variable-2 {color: #05a;}
 .cm-s-default .cm-variable-3 {color: #085;}
-.cm-s-default .cm-property {color: black;}
-.cm-s-default .cm-operator {color: black;}
 .cm-s-default .cm-comment {color: #a50;}
 .cm-s-default .cm-string {color: #a11;}
 .cm-s-default .cm-string-2 {color: #f50;}

mode/erlang/erlang.js

@@ -348,7 +348,7 @@ CodeMirror.defineMode("erlang", function(cmCfg) {
     switch (type) {
       case "atom":        return "atom";
       case "attribute":   return "attribute";
-      case "boolean":     return "special";
+      case "boolean":     return "atom";
       case "builtin":     return "builtin";
       case "close_paren": return null;
       case "colon":       return null;