Modify the tip message for can't find template directory.

Author: zhangbin

plugins/project_new/project_new.py

@@ -238,7 +238,7 @@ def _scan(self):
         if len(folders) == 0:
             cur_engine = "cocos2d-x" if self._lang == "js" else "cocos2d-js"
             need_engine = "cocos2d-js" if self._lang == "js" else "cocos2d-x"
-            engine_tip = "You can't create a %s game in %s. Please use %s instead." % (self._lang, cur_engine, need_engine)
+            engine_tip = "You can specify the path of %s by argument '-e'." % need_engine
             message = "Fatal: can't find any template for <%s> language in %s\n%s" % (self._lang, templates_dir, engine_tip)
             raise cocos.CCPluginError(message)