mruby/mruby — pull request #1155 by monaka (2013-04-07 02:58:20+00:00)
Title: Support $0 variable.

Results after applied this patch:
```
$ bin/mruby -e 'p $0'
"-e"
$ echo 'p $0' | bin/mruby
"-"
$ echo 'p $0' > hoge | bin/mruby hoge
"hoge"
```