Update CHANGELOG for 0.7.1 release
Update CHANGELOG for 0.7.1 release

nwolfe/trapperkeeper-webserver-jetty9,rlinehan/trapperkeeper-webserver-jetty9,camlow325/trapperkeeper-webserver-jetty9,fpringvaldsen/trapperkeeper-webserver-jetty9,puppetlabs/trapperkeeper-webserver-jetty9,richardc/trapperkeeper-webserver-jetty9,richardc/trapperkeeper-webserver-jetty9,nwolfe/trapperkeeper-webserver-jetty9,puppetlabs/trapperkeeper-webserver-jetty9,rlinehan/trapperkeeper-webserver-jetty9,camlow325/trapperkeeper-webserver-jetty9,fpringvaldsen/trapperkeeper-webserver-jetty9