Correct file permissions for ssh keys and config.

generate-ssh-key.sh

ssh-keygen -t rsa -b 4096 -N '' -C "email@example.com" -f ~/.ssh/id_rsa
ssh-keygen -t rsa -b 4096 -N '' -C "email@example.com" -f ~/.ssh/github_rsa
ssh-keygen -t rsa -b 4096 -N '' -C "email@example.com" -f ~/.ssh/mozilla_rsa

ssh-key-add.sh

eval "$(ssh-agent -s)"
ssh-add ~/.ssh/id_rsa
ssh-add ~/.ssh/github_rsa
ssh-add ~/.ssh/mozilla_rsa

ssh-key-permissions.sh

chmod 700 ~/.ssh
chmod 644 ~/.ssh/authorized_keys
chmod 644 ~/.ssh/known_hosts
chmod 644 ~/.ssh/config
chmod 600 ~/.ssh/id_rsa
chmod 644 ~/.ssh/id_rsa.pub
chmod 600 ~/.ssh/github_rsa
chmod 644 ~/.ssh/github_rsa.pub
chmod 600 ~/.ssh/mozilla_rsa
chmod 644 ~/.ssh/mozilla_rsa.pub