Generate resource bundle targets for not-build targets.

This can been skipped for not-build targets. In addition, there needs to
be a target dependency from the aggregate target to the resource bundle
target so that it is actually getting built.
Removed accidential Swift branch leakage
Added a spec which tests the installation of resources in case of a Pod without sourcefiles.

Conflicts:
	spec/cocoapods-integration-specs
	spec/integration.rb
Unit test for resource bundle target depedencies.
[Changelog] For PR #2934
Updated integration spec submodule.

Conflicts:
	spec/cocoapods-integration-specs
Merge pull request #2934 from CocoaPods/fix-resource-bundles-for-not-build-targets

Fix resource bundles for not build targets