INFRA-118 - Add GitRepo->getCommit()
INFRA-118 - Implement GitRepo->getRemotes() and GitRepo->getRemoteUrl()
INFRA-118 - Implement ExportCommand
INFRA-118 - Add GitFormatterInterface
INFRA-118 - Implement DiffCommand (with text+json output)
Merge pull request #5 from totten/master-branch-crud

INFRA-118 - Implement ExportCommand and DiffCommand