Do not require redis

[mikehale]

Provide a memory only mode

[asenchi]

Besides the issues with the gem (#6), you can already do this. I just committed some changes to the gemspec, but I am going to revert those.

Throttle.setup(Hash.new)

I need to push some changes that don't force Redis to be there.

[asenchi]

Ok, these are in master, I need to address/test #6, but I'll get a new release out soon.