Inherit ONLY_ACTIVE_ARCH on iOS, just like OS X
Set LD_RUNPATH_SEARCH_PATHS per platform
Set a default PRODUCT_NAME for frameworks

Helps when the target name is too specific (e.g., ReactiveCocoa-iOS)
Inherit platform settings

These are notoriously fragile, so just rely upon Xcode’s defaults.
Merge pull request #29 from jspahrsummers/more-swift-fixes

More Swift/Xcode 6.1 fixes