Added User-Agent header for gist api call.
Added User-Agent header for gist api call.

To satisfy http://developer.github.com/v3/#user-agent-required
binford2k/puppet-irc,binford2k/puppet-irc,jenkins-infra/puppet-irc,jamtur01/puppet-irc,jenkins-infra/puppet-irc,jantman/puppet-ircreporter,jamtur01/puppet-irc