[COOK-2000] Make mode of sshd_config a configurable option

Signed-off-by: Seth Vargo <sethvargo@gmail.com>
[COOK-2517] Add hash support for ssh_config

Signed-off-by: Seth Vargo <sethvargo@gmail.com>
Fix README formatting
Merge branch 'master' of github.com:opscode-cookbooks/openssh