Swap codegangsta for urfave

apps/gitlab-runner-helper/main.go

commands/exec.go

commands/helpers/artifacts_downloader.go

commands/helpers/artifacts_uploader.go

commands/helpers/cache_archiver.go

commands/helpers/cache_extractor.go

commands/list.go

commands/multi.go

commands/register.go

commands/service.go

commands/single.go

commands/unregister.go

commands/verify.go

common/command.go

common/mock_Commander.go

common/version.go

helpers/cli/cpuprofile.go

helpers/cli/fix_home.go

helpers/cli/log_level.go

helpers/cli/runtime_platform.go