Xu Cheng af1eb007e2 help: handle alias
Before this fix
```
$ brew --help ls
Error: Unknown command: ls
```

After this fix
```
$ brew --help ls
brew list, ls
<snip>
```
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Homebrew's Formula API

This is the (partially) documented public API for Homebrew.

The main class you should look at is the {Formula} class (and classes linked from there). That's the class that's used to create Homebrew formulae (i.e. package descriptions). Assume anything else you stumble upon is private.

You may also find the Formula Cookbook and Ruby Style Guide helpful in creating formulae.

Good luck!