Use shallow cloning
Add more commits in fixtures
add test, WIP
update the submodule reference, fail properly
make sure branches, tags and commits keep working
[GitHub] Remove strategy
[HTTP] Use fixtures
[Travis] Cleanup configuration
[Rubocop] Modernize
[Rakefile] cleanup
[Cache] ASTA LA VISTA, BABY
[Specs] Spelling
[Git] Cleanup specs
[Git] Fix spec due to fixture update
[Git] Disable shallow submodule spec
[Git] Cleanup implementation
[Git] Fix head downloads with specific options
Use $? instead of $CHILD_STATUS

See https://github.com/CocoaPods/cocoapods-downloader/issues/28#issuecomment-52446240