drop numpy 1.6.2 tests (numpy probably works, but mpl isn't built for it)
drop numpy 1.6.2 tests (numpy probably works, but mpl isn't built for
it)

dinossimpson/pyspeckit,keflavich/pyspeckit,pyspeckit/pyspeckit,bsipocz/pyspeckit,jpinedaf/pyspeckit,low-sky/pyspeckit,mikelum/pyspeckit,vlas-sokolov/pyspeckit,pyspeckit/pyspeckit,e-koch/pyspeckit,bsipocz/pyspeckit,mikelum/pyspeckit,dinossimpson/pyspeckit,keflavich/pyspeckit,e-koch/pyspeckit,vlas-sokolov/pyspeckit,jpinedaf/pyspeckit,allisony/pyspeckit,low-sky/pyspeckit,allisony/pyspeckit