Use host target for frameworks of XPC services

References https://github.com/CocoaPods/Xcodeproj/pull/428

Release 1.1.0.rc.3

# gpg: Signature made Tue 11 Oct 07:51:17 2016 PDT using RSA key ID 3CE43CC7
# gpg: Good signature from "keybase.io/dantoml <dantoml@keybase.io>"
# gpg:                 aka "Danielle Tomlinson (https://circleci.com) <dani@circleci.com>"
# gpg:                 aka "Danielle Tomlinson (https://dantoml.com) <dan@tomlinson.io>"
# gpg:                 aka "Danielle Tomlinson (iCloud) <danieltomlinson@me.com>"

Wrap generated import headers using __OBJC__ for C only pods

Only use EMBEDDED_CONTAINT_CONTAINS_SWIFT on Swift <= 2.3

Greenify success message

Update to fourflusher 2

Allow passing --swift-version to pod spec/lib lint

Improve handling of mismatched Swift versions

Raises an Informative when a pod is shared between TargetDefinitions
that have different SWIFT_VERSION flags.