Updating README to point to stable docs
Updating README to point to stable docs

This is a minor patch that updates the README to point to the stable
documentation.

codedellemc/rexray,ltouati/rexray,akutz/rexray,ltouati/rexray,codedellemc/rexray,akutz/rexray,codedellemc/rexray,codedellemc/rexray,akutz/rexray,emccode/rexray,thecodeteam/rexray,oppodeldoc/rexray,emccode/rexray,clintonskitson/rexray,clintonskitson/rexray,oppodeldoc/rexray,emccode/rexray,oppodeldoc/rexray,thecodeteam/rexray,thecodeteam/rexray,cduchesne/rexray,ltouati/rexray,thecodeteam/rexray,codedellemc/rexray,cduchesne/rexray,cduchesne/rexray,cduchesne/rexray,oppodeldoc/rexray,akutz/rexray,codedellemc/rexray,cduchesne/rexray,thecodeteam/rexray,cduchesne/rexray,akutz/rexray,akutz/rexray,thecodeteam/rexray,ltouati/rexray,clintonskitson/rexray,emccode/rexray,oppodeldoc/rexray,oppodeldoc/rexray,clintonskitson/rexray