Disable selinux / apparmor
Remove obsolete CHANGELOG
Fix placement of chef-sentry-handler cookbook
Report OS as extra data on failures
Add a check for root user in install script
Add a check for OS in install script
Log fatal, unexpected, errors
Add a match-version command

This lets us ensure that we recreate configuration files in the
dist/install.sh script after an update.

As a general rule dist/install.sh is for first-time installs, so it's
likely that if someone is updating and re-running it, they're doing so
because something is broken (which might be the configuration file!).
Tests: ensure work_dir is always deleted
Release: 7.7.0
Merge pull request #87 from Scalr/release-7.7.0

Release 7.7.0