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Supports alternative Redis configurations without requiring hacks to the plugin file

Prevent redeclaration fatals when the object cache class is instantiated more than once, as happens with Batcache.

The `WP_Object_Class` implementation already leverages the data these two methods manipulate.

Update README.md

tiny correction in code

added an alternative connection to Redis. Copied this information from https://raw.github.com/nrk/predis/v0.8/README.md