Created connection pool that lives across requests so that we can reuse connections.  Removed close method, since we don't want to close connections at the end of a request.

We can't inherit a class from a basestring and instantiate it, so I changed
the base class to 'object' so we can still to the type checking.

I also discovered a bug with the Django 1.3 compatibility work.  In the
incr_version method, we were using the Redis's rename function to move the key,
but in Redis 2.0 you cannot rename a volitile key.

Added some moar authors

Separated the 1.3 compatible cache class from the rest of the code and reverted a few unneeded changes.

This also handles the key better internally to prevent multiple "making" of the key.

Only fall back to localhost if the URI is "redis_cache.cache://"

django-redis-cache for django 1.3 (not compatible with 1.2 : new parameters to methods in BaseCache)

Thanks to Kami for the report and Jezdez for being awesome.