[Kicker] Run quiet bacon
[UserProjectIntegrator] Add support for Xcodeproj::Workspace::FileReference

See https://github.com/CocoaPods/Xcodeproj/pull/150
[Travis] Update configuration for new mac workers
[Travis] Set UTF-8 encoding
[Travis] Use spec rake task
[Changelog] Add note for improved support for file references
Support relative redirects when validating URLs.

This fixes CocoaPods/Core#104
Helpful exception when reading version information with merge conflict

related to https://github.com/CocoaPods/CocoaPods/issues/1853, https://github.com/CocoaPods/CocoaPods/issues/2065, https://github.com/CocoaPods/CocoaPods/issues/2056 etc.
Improved error message when pulling a spec repo raises

Closes https://github.com/CocoaPods/CocoaPods/issues/1914
Move repo update to install section of travis.yml
Fixed test for relative redirect.

As / points to the root of the domain, the expected result was actually wrong.
Use the new HTTP module from Core instead of duplicating the code here.
[linter] Clean up web mock's after tests
[Bundle] Update

Needed so that the test that depend on Core work (re HTTP requests)
[linter] Refactor URL validation tests
[linter] Check social_media_url is valid HTTP URL
[linter] Check documentation_url is valid HTTP URL
[linter] Check docset_url is valid HTTP URL
Merge pull request #2078 from carsonmcdonald/travisrepoupfix

Move repo update to install section of travis.yml
[Gemspec] Add dependency on cocoapods-plugins
Closes https://github.com/CocoaPods/CocoaPods/issues/2092