Added Travis-CI Badge to README.md
Added Travis-CI Badge to README.md

The Travis-CI badge was added to the top of the README markdown.

thecodeteam/rexray,taik0/rexray,emccode/rexray,cduchesne/rexray,taik0/rexray,oppodeldoc/rexray,ltouati/rexray,clintonskitson/rexray,codedellemc/rexray,cduchesne/rexray,codedellemc/rexray,ltouati/rexray,clintonskitson/rexray,thecodeteam/rexray,cduchesne/rexray,ltouati/rexray,akutz/rexray,akutz/rexray,cduchesne/rexray,taik0/rexray,oppodeldoc/rexray,cduchesne/rexray,codedellemc/rexray,oppodeldoc/rexray,clintonskitson/rexray,codedellemc/rexray,akutz/rexray,emccode/rexray,thecodeteam/rexray,akutz/rexray,akutz/rexray,oppodeldoc/rexray,robnolen/rexray,thecodeteam/rexray,emccode/rexray,cduchesne/rexray,oppodeldoc/rexray,akutz/rexray,codedellemc/rexray,codedellemc/rexray,clintonskitson/rexray,emccode/rexray,thecodeteam/rexray,ltouati/rexray,thecodeteam/rexray,oppodeldoc/rexray,robnolen/rexray