Updates rake file to build against iOS 7.1
Updates rake file to build against iOS 7.1

Runs iOS specs against 7.0, so 7.0 simulator is required

tjarratt/cedar,idoru/cedar,idoru/cedar,pivotal/cedar,irfanah/cedar,tjarratt/cedar,irfanah/cedar,jeffh/cedar,hsienchiaolee/cedar,tjarratt/cedar,pivotal/cedar,briancroom/cedar,pivotal/cedar,briancroom/cedar,briancroom/cedar,irfanah/cedar,pivotal/cedar,tjarratt/cedar,tjarratt/cedar,briancroom/cedar,briancroom/cedar,jeffh/cedar,jeffh/cedar,hsienchiaolee/cedar,jeffh/cedar,hsienchiaolee/cedar,idoru/cedar,jeffh/cedar,irfanah/cedar,idoru/cedar,idoru/cedar,hsienchiaolee/cedar,pivotal/cedar