Get files_at_path and directories_at_path working
Fix make_file
Fix adding README.md
Get stringify/download_as_string working
Write tests for git_repo path methods + stringify
Formatting
Refactor tests
Fix func decl styling
Be able to get author of commit
Merge pull request #1646 from oneohtrix/git

Implement files_at_path, directories_at_path, and stringify + write tests