[Validator] Allow skipping import validation (complete)

[Travis] Test Ruby 2.4

Fixes warnings on Ruby 2.4

Do not link static frameworks when inheriting search paths

[ISSUE TEMPLATE] Add a note about Nanaimo LoadError's

[Repo::Add] Add --progress option to show git progress

Git added a `--progress` option in 1.7.0 (earliest tag containing
https://github.com/git/git/commit/5a518ad4679c91f0d0afd38fcc3cbf04e8699c46).

This commit adds an option to Repo::Add to pass this to git, and makes
Setup pass it by default.

Release 1.2.0.beta.3

# gpg: Signature made Wed 28 Dec 17:39:03 2016 CET
# gpg:                using RSA key 35D2D0983CE43CC7
# 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>"

Removed extension integration errors about mismatched Swift version / platform

[Sources] reset --hard rather than git pull

`pod repo push` now accepts the `--swift-version` argument.

Add aggregated search paths targets to vendored build settings

Fix #5512

Fix default LD_RUNPATH_SEARCH_PATHS for host targets