lsegal/yard — pull request #670 by kou (2013-05-01 08:40:55+00:00)
Title: Fix a bug that the default value of --po-dir isn't expanded

`yardoc --help` shows raw Ruby expression as `--po-dir`'s default value.

```
% bin/yardoc --help
...
--po-dir DIR The directory that has .po files.
(defaults to #{YARD::Registry.po_dir})
...
```