Can't Install Gem

Hi,

Thanks for creating this project! I'd like to use it, but I can't seem to install the gem. When I enter the following commands in my Terminal:

```
$ gem sources -a http://gems.github.com
$ sudo gem install avh4-ruby-sync
```

I get: `ERROR: could not find gem avh4-ruby-sync locally or in a repository`

Do you know what might be wrong and/or how to fix this?

Thanks.