Don't cast keys to Integers. Enables textual keys.

[jof]

This is a potential fix for Issue #25.

There are several places in the adapter where textual keys from redis are cast to integers. While conventional, this breaks retrieving or enumerating stored model instances where the key is non-numeric.

While this fixes this issue for me, the current master still fails some rspec tests that are included in from DataMapper.

[whoahbot]

Hi jof,

Thanks so much for the patch! I'll have a look at this tonight and see if I can get the rest of the specs passing again.

[jof]

You're welcome. Thanks so much for dm-redis-adapter!

I'm making a small Resque-like application and need to store a few things where I just need to check the validity of a few properties.
Shoeing in redis as a simple database-like cache made this really simple (instead of also installing a full-blown RDBMS).

[whoahbot]

I think there is one more patch to make this work fully, but I'll merge in this pull request and then apply that.