Added curl installation script
Added curl installation script

This patch adds the curl installation script 'install' so that users can
execute the following command to download and install REX-Ray:

  curl -sSL https://dl.bintray.com/emccode/rexray/install | sh -

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