Add workaround for XCTest not being available to non-test targets
Add workaround for XCTest not being available to non-test targets

Adds XCTest framework search path to the Specta pod target so that it's able to
build. As of Xcode 6 XCTest is only available to test targets, and Cocoapods
doesn't have a fix for this on master yet.

RobotsAndPencils/RPJSContext,RobotsAndPencils/RPJSContext