Updated hacking docs with missing information
Updated hacking docs with missing information

R=
CC=
https://codereview.appspot.com/13828044

jrwren/juju-gui,mitechie/juju-gui,jrwren/juju-gui,CanonicalJS/juju-gui,mitechie/juju-gui,CanonicalJS/juju-gui,CanonicalJS/juju-gui,bac/juju-gui,bac/juju-gui,bac/juju-gui,bac/juju-gui,mitechie/juju-gui,jrwren/juju-gui,jrwren/juju-gui,mitechie/juju-gui