[Sandbox] Got `pod` command without any args to work.
[Sandbox] Get `pod install` to work and run `rake examples:build` in the sandbox.
[Sandbox] Get Ruby paths the right way.
[Sandbox] Allow spec repos to be written to (update).
[Sandbox] Cleanup TODOs.
[Sandbox] No need to write the profile to disk, just use the `-p` option.
[Sandbox] Move TODOs to #939 and add some documentation.
[Sandbox] Add note about tailing system.log
[Sandbox] Allow all outbound network connections for now.
Error template questions left unanswered means the ticket will be closed.
[Config] Restore support for CocoaPods.podfile

Closes #1004
[Sandbox::FileAccessor] Add support for private_header_files

Closes #998
[Integration] Update fixtures
Release 0.19.0
Changelog [ci skip]
Changelog [ci skip]

Closes #1012
[Generator::Xcconfig] Add inherited to GCC_PREPROCESSOR_DEFINITIONS

See #903
[TargetInstaller] Create unique hash instances for the build settings

Closes #1014
CHANGELOG [skip ci]
[Integration] Update version in fixtures