changing icons to those from Oxygen, which look a little more constistant
changing icons to those from Oxygen, which look a little more constistant

ContinuumIO/chaco,tommy-u/chaco,ContinuumIO/chaco,tommy-u/chaco,burnpanck/chaco,burnpanck/chaco,tommy-u/chaco,burnpanck/chaco,ContinuumIO/chaco,ContinuumIO/chaco