Returns github accountname, repo name and current branch.
| 1 2 | github_credentials_helper(ghaccount = NULL, ghrepo = NULL,
  branch = NULL, location = ".")
 | 
| ghaccount | Github account name | 
| ghrepo | Github repository name | 
| branch | branch name such as master, develop etc | 
| location | defaults to current location | 
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