Add Pod lib command #850

Tests are still missing.
Merge branch 'master' into lib-subcommand

* master: (59 commits)
  [Bundle] update
  Update CHANGELOG.md
  Release 0.21.0.rc1
  [Gemspec] Update Xcodeproj
  [Bundle] update
  Changelog
  [Bundle] Update
  [Fixtures] Update for release
  [Bundle] Update
  [Rakefile] Examples robustness for future versions of Xcode
  [CHANGELOG]
  [Generator::Xcconfig] Docs
  [Bundle] Use Xcodeproj from master
  [Installer] Rename #targets to #aggregate_targets
  Add files which were creating issues with git
  Delete files creating issues with git
  Update integration test fixtures
  Case change for case-sensitive file systems
  Update tests
  Move method below attributes
  ...

Conflicts:
	Gemfile.lock
Use cp instead of rsync to copy frameworks (refs #1063).

Add mkdir command to make sure the folder Contents/Frameworks exists (otherwise the first framework becomes this folder).
Change rsync command to cp to keep the file structure and all symbolic links.
Remove usage of deprecated ALWAYS_SEARCH_USER_PATHS build setting
CHANGELOG
[Installer] Use aggregate target for library reppresentation

Closes #1157
[SandboxAnalyzer] mark as changed Pods whose head state doesn't mathc

Closes #1160
[SandboxAnalyzer] Fix spelling
[Changelog]
[Config] Allow to set the size of the cache.

- This also fixes a bug which lead CocoaPods to always use the
  aggressive cache.
Merge branch 'master' of https://github.com/ashtom/CocoaPods into ashtom-master

* 'master' of https://github.com/ashtom/CocoaPods:
  Use cp instead of rsync to copy frameworks (refs #1063).
Use cp instead of rsync to copy frameworks 2

Closes #1063
Merge branch 'lib-subcommand'

* lib-subcommand:
  Add Pod lib command #850
Add Pod lib command 2

Closes #850
Merge branch 'disable-ALWAYS_SEARCH_USER_PATHS'

* disable-ALWAYS_SEARCH_USER_PATHS:
  CHANGELOG
  Remove usage of deprecated ALWAYS_SEARCH_USER_PATHS build setting

Conflicts:
	spec/integration/install_add_pod/after/Pods/Pods-JSONKit-Private.xcconfig
	spec/integration/install_add_pod/after/Pods/Pods-Reachability-Private.xcconfig
	spec/integration/install_add_pod/after/Pods/Pods.xcconfig
	spec/integration/install_custom_workspace/after/Pods/Pods-SampleApp_1-Reachability-Private.xcconfig
	spec/integration/install_custom_workspace/after/Pods/Pods-SampleApp_1.xcconfig
	spec/integration/install_custom_workspace/after/Pods/Pods-SampleApp_2-Reachability-Private.xcconfig
	spec/integration/install_custom_workspace/after/Pods/Pods-SampleApp_2.xcconfig
	spec/integration/install_external_source/after/Pods/Pods-PodTest-Private.xcconfig
	spec/integration/install_external_source/after/Pods/Pods.xcconfig
	spec/integration/install_local_source/after/Pods/Pods-Reachability-Private.xcconfig
	spec/integration/install_local_source/after/Pods/Pods.xcconfig
	spec/integration/install_multiple_targets/after/Pods/Pods-Reachability-Private.xcconfig
	spec/integration/install_multiple_targets/after/Pods/Pods-SampleApp_2-JSONKit-Private.xcconfig
	spec/integration/install_multiple_targets/after/Pods/Pods-SampleApp_2-Reachability-Private.xcconfig
	spec/integration/install_multiple_targets/after/Pods/Pods-SampleApp_2.xcconfig
	spec/integration/install_multiple_targets/after/Pods/Pods-test-JSONKit-Private.xcconfig
	spec/integration/install_multiple_targets/after/Pods/Pods-test.xcconfig
	spec/integration/install_multiple_targets/after/Pods/Pods.xcconfig
	spec/integration/install_new/after/Pods/Pods-Reachability-Private.xcconfig
	spec/integration/install_new/after/Pods/Pods.xcconfig
	spec/integration/install_podfile_callbacks/after/Pods/Pods-Reachability-Private.xcconfig
	spec/integration/install_podfile_callbacks/after/Pods/Pods.xcconfig
	spec/integration/install_podspec/after/Pods/Pods-Reachability-Private.xcconfig
	spec/integration/install_podspec/after/Pods/Pods.xcconfig
	spec/integration/install_remove_pod/after/Pods/Pods-Reachability-Private.xcconfig
	spec/integration/install_remove_pod/after/Pods/Pods.xcconfig
	spec/integration/install_spec_callbacks/after/Pods/Pods-Reachability-Private.xcconfig
	spec/integration/install_spec_callbacks/after/Pods/Pods.xcconfig
	spec/integration/install_subspecs/after/Pods/Pods-OS X App-PodTest-Private.xcconfig
	spec/integration/install_subspecs/after/Pods/Pods-OS X App.xcconfig
	spec/integration/install_subspecs/after/Pods/Pods-iOS App-PodTest-Private.xcconfig
	spec/integration/install_subspecs/after/Pods/Pods-iOS App.xcconfig
	spec/integration/update/after/Pods/Pods-Reachability-Private.xcconfig
	spec/integration/update/after/Pods/Pods.xcconfig
[CopyResourcesScript] Abort on any error

Closes #1098
[TargetIntegrator] Don't show environment in shell scripts

Closes #1122
[Installer] Add target dependencies explicitely [WIP]

See #1165
[Installer] Add target dependencies explicitely 2

Closes #1165
[CHANGELOG] Some small improvements/fixes.