[bindings/swift] Support Xcode 8 and Swift 2.3
[bindings/swift] Support Xcode 8 and Swift 2.3

jspahrsummers/Arbiter,jspahrsummers/Arbiter,ArbiterLib/Arbiter,ArbiterLib/Arbiter,jspahrsummers/Arbiter,jspahrsummers/Arbiter,ArbiterLib/Arbiter,ArbiterLib/Arbiter