:namespace key never works

[evanphx]

The code conspires against using :namespace as an alias for :prefix_key.

The code here: https://github.com/evan/memcached/blob/master/lib/memcached/memcached.rb#L110

Makes the code here: https://github.com/evan/memcached/blob/master/lib/memcached/memcached.rb#L153

Into a noop. The :namespace key will never be there on line 153 because it was deleted on line 110.

Suggest that the code on 153 either use opts[:namespace] or explicitly pull it out before pruning @options on 110.

[evan]

I'm inclined to just drop it from memcached.rb since the Rails adaptor handles it correctly; what do you think?

[evanphx]

If you do, blow up when someone uses it. Otherwise they'll use it and it will silently not work.

[evan]

Good point; will do.

[evan]

fixed