Fix up the compilation process

lib/handlebars/handlebars_lexer.js

@@ -1,8 +1,7 @@
-if(exports) {
-  var Handlebars = {};
-  Handlebars.Lexer = require("handlebars/jison_ext").Lexer
-}
+var Handlebars = {};
+Handlebars.Lexer = require("handlebars/jison_ext").Lexer
 
+// BEGIN(BROWSER)
 Handlebars.HandlebarsLexer = function() {
   this.state = "CONTENT";
 };
@@ -122,5 +121,6 @@ Handlebars.HandlebarsLexer.prototype.lex = function() {
     return "CONTENT"
   }
 };
+// END(BROWSER)
 
-if(exports) { exports.Lexer = Handlebars.HandlebarsLexer; }
+exports.Lexer = Handlebars.HandlebarsLexer;