Update README.rst

Fixing broken link
Add FreeBSD compatibility
Merge pull request #14 from alanpearce/freebsd

Add FreeBSD compatibility
Remove reference to root group

By not specifying it, root user's group should be used.
Merge pull request #15 from alanpearce/root-group

Remove reference to root group
Config: Refactor host key provisioning into loop
Config: Add support for ECDSA host keys
Update pillar.example
Merge pull request #16 from alanpearce/ecdsa

Add support for ECDSA host keys
Config: Add support for generating keys
Update pillar example
Merge pull request #17 from alanpearce/generate-keys

Config: Add support for generating keys
allow for "Match" inside of an sshd_config
remove prefix when not needed
Fix a typo in the match jinja
fix a typo in keywords being sent improperly
defaults do not need a prefix
make sure to match options as the options dict!
add pillar example
fix comment