Hub is broken

Annoying:

```
salty-wordpress ➜  wp-cli  hub
/usr/lib/ruby/1.9.1/rubygems/dependency.rb:247:in `to_specs': Could not find hub (>= 0) amongst [] (Gem::LoadError)
	from /usr/lib/ruby/1.9.1/rubygems/dependency.rb:256:in `to_spec'
	from /usr/lib/ruby/1.9.1/rubygems.rb:1231:in `gem'
	from /usr/local/bin/hub:22:in `<main>'
```