Added a spec which tests installation of resources.
[Source Manager] Fix issue with source without URL

Closes #2965
Merge pull request #2939 from CocoaPods/add-resources-spec

Added a spec which tests installation of resources.
[installer] Group support added for Development Pods mirroring the folder structure
Some parameters renamed, and a clarifying comment added
[Project] Remove trailing whitespace
Merge branch 'issue/2145'
Merge pull request #2973 from CocoaPods/issue/2965

[Source Manager] Fix issue with source without URL
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
[gemspec] Bump Xcodeproj to `~> 0.21.0`
[Rakefile] Ensure hg is installed before rebuilding the integration fixtures

Closes https://github.com/CocoaPods/CocoaPods/issues/2977
[gemspec] Bump claide to `~> 0.8.0`
[gemspec] Bump molinillo to `~> 0.2.0`