Revising run on devices specs

Previous versions of Xcode 6 beta did not allow targeting iOS 6 and previous iOS 8 betas did not allow Xcode 5.1.1 targets to run.  

Confused?

Me too. :)

I removed the conditional statements that ignored previously unsupported Xcode + iOS combinations.

### Analysis

iOS 8 beta 5 does not support instruments or Instruments.app.

* https://gist.github.com/jmoody/601f9c9b704cd5e4dde9