Using local remotes to validate behavior

[woojiahao]

Based on git-mastery/exercises#124

Right now, when we deal with a remote repository, we often mock the calls to that repository as we initially assume it to be hosted on Github.

However, with the refactoring work for repo-smith version v1.0.0, I realized that it is possible to have a clone of a "remote" repository where the remote repository is actually stored on the local machine as a bare repository (more here). So, we might be able to work with this without doing all of these mocked behavior.