mruby/mruby — pull request #1428 by murasesyuka (2013-08-02 07:49:02+00:00)
Title: add mrbc -h option

I expected,

```bash
$ ./bin/mrbc -h
Usage: ./bin/mrbc [switches] programfile
switches:
-c check syntax only
-o place the output into
-v print version number, then turn on verbose mode
-g produce debugging information
-B binary output in C language format
--verbose run at verbose mode
--version print the version
--copyright print the copyright
```

but cause this show.

```bash
$ ./bin/mrbc -h
./bin/mrbc: cannot open program file. (-h)
```