Merge pull request #7 from adamcrews/release

Bumped a new release to support Nessus 6
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nessuscli is in /opt/nessus/sbin
add support for security center setup
add simple spec for security_center
document security_center
fix activate nessus check
user changes need a service restart
activation code fact needs sbin for nessuscli
Merge pull request #8 from adamcstephens/nessuscli_fix

nessuscli is in /opt/nessus/sbin
Merge pull request #9 from adamcstephens/security_center

add support for security center setup
Merge pull request #10 from adamcstephens/user_change_restart

user changes need a service restart
Fix a couple lint warnings and cut a new release