fix for xcode 'legacy' build locations, so that products from Pods.xcodeproj get resolved correctly from user's xcodeproj targets, updating changelog

Support for spaces in full path to executables.

Lint as framework automatically

Offers `--use-libraries` to still lint as a static library, if required.

Require explicit use of `use_frameworks!`

Closes #3029

[ExternalSource] Coerce podspec string contents to json to store in the ...

Closes https://github.com/CocoaPods/CocoaPods/issues/2685.

[RuboCop] Favor if over unless for negative conditions. Don't use parentheses around the condition of an if.

Closes https://github.com/CocoaPods/CocoaPods/issues/2992.

implemented Xcode license check for `pod setup`

Copy Swift libraries using `rsync -u`

This should ensure that they're not recopied if unchanged, because the
destination will be newer if they changed due to code-signing.

[Installer] Reject installation if a static library is used as a transit...

[Installer] Reject installation if a static library is used as a transitive dependency while integrating Pods as frameworks.

Configure as extension only for watch extensions

[Frameworks] Fail lint for Swift on iOS < 8.

Since we now have our own error for this, it should be filtered,
especially considering that it might be confusing for people linting
with `--use-frameworks`.