Filenames with spaces are not supported

[abelgomez]

Running the sharelatex-git command on repositories containing files with spaces fails with the following error:

$ sharelatex-git -n -e hidden@hidden.com https://hidden
[2018/05/14 17:21:35] Downloading files from https://hidden...
Enter password:
[2018/05/14 17:21:38] Logging in https://hidden with user hidden@hidden.com...
[2018/05/14 17:21:39] Decompressing files...
[2018/05/14 17:21:39] Adding file hidden1
[2018/05/14 17:21:39] Adding file hidden2
...
[2018/05/14 17:21:40] Error executing "git add hidden/file with spaces": error code 128. Output: b"fatal: pathspec 'hidden/file' did not match any files\n"