allow openuri memcached to be used with new memcached versions

[slatem]

The memcache version here is ancient. This patch will allow backwards compatibility.

[benschwarz]

This patch also means that rails is required.
Tbh, I wouldn't recommend that anyone uses this project.

[slatem]

I hear ya. Seemed pretty old but I thought I'd give it a try. Seems to be working for me with the aforementioned change.

Here is the wrapper code:
https://github.com/evan/memcached/blob/master/lib/memcached/rails.rb

[benschwarz]

Cool! — Glad it's working for you.