Updates for Xcode 6 GM.

Updates the instruments build number, and handles 'instruments -s' failing

to tell us the path to Automation.tracetemplate.
Merge pull request #287 from iamleeg/xcode-6-gm

Updates for Xcode 6 GM.
commit 98f6cef4bf1227748c9722ad485bde957fcd9cad
Author: Bijoy Vijayachandran <bvijayachandran@paypal.com>
Date:   Tue Sep 16 13:20:47 2014 +0530

    Xcode betas don't have old model iPhone simulators, making iPhone 5s/iPad 2 default