Added Ruby 2.0.0 and 2.1.0 versions to travis file.
Added Ruby 2.0.0 and 2.1.0 versions to travis file.

SPBTV/spbtv_redis_failover,jongillies/redis_failover,ShrCheng/redis_failover,ryanlecompte/redis_failover,flowdock/redis_failover