reverting removal of TRAITSBACKENDWX extras_require for chaco
reverting removal of TRAITSBACKENDWX extras_require for chaco

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