Init the plugin

        Available configuration:
        ::

            plugins:
                - plugin_module: inginious.frontend.plugins.git_repo
                  repo_directory: "./repo_submissions"

def init(plugin_manager, _, _2, config):
    """
        Init the plugin

        Available configuration:
        ::

            plugins:
                - plugin_module: inginious.frontend.plugins.git_repo
                  repo_directory: "./repo_submissions"

    """
    submission_git_saver = SubmissionGitSaver(plugin_manager, config)
    submission_git_saver.daemon = True
    submission_git_saver.start()