Revert "Remove need for sudo, ensure $GITHOME/.ssh/authorized_keys is -rw-rw-rw-."

This reverts commit 6cb2eeb2fa17394ba95f66b3782e01c9bd8479f5.

fixes #10
Merge pull request #11 from asm89/revert-chmod-ssh

Revert "Remove need for sudo, ensure $GITHOME/.ssh/authorized_keys is -r...