Quick

Quick.xcodeproj: Fix tests on Xcode 6.3

`rake` tests would fail due to:

1. Incorrect, pre-Swift 1.2 version of Nimble was linked to
   QuickFocused-iOSTests.
2. Necessary architectures were unavailable when building via
   xcodebuild.

Build all architectures and link the correct version of Nimble.