temporary add

announcing nate's upcoming webinar
Update README.md
cluster_launch: correcting public_target to public_hostname
Version bump to 4.7.5
Regenerate gemspec for version 4.7.5
Merge branch 'master' of github.com:infochimps-labs/ironfan
Rakefile: making summary a summary, and different from description
cluster_kick.rb: adding chef-client-nonce invocation
Version bump to 4.7.6
Regenerate gemspec for version 4.7.6
Version bump to 4.7.7