make observing example work in numpy 1.10
make observing example work in numpy 1.10

dhomeier/astropy,lpsinger/astropy,kelle/astropy,larrybradley/astropy,StuartLittlefair/astropy,lpsinger/astropy,saimn/astropy,lpsinger/astropy,aleksandr-bakanov/astropy,joergdietrich/astropy,MSeifert04/astropy,StuartLittlefair/astropy,saimn/astropy,StuartLittlefair/astropy,dhomeier/astropy,stargaser/astropy,tbabej/astropy,stargaser/astropy,larrybradley/astropy,astropy/astropy,funbaker/astropy,AustereCuriosity/astropy,MSeifert04/astropy,funbaker/astropy,joergdietrich/astropy,DougBurke/astropy,joergdietrich/astropy,astropy/astropy,DougBurke/astropy,MSeifert04/astropy,joergdietrich/astropy,aleksandr-bakanov/astropy,mhvk/astropy,bsipocz/astropy,stargaser/astropy,funbaker/astropy,tbabej/astropy,joergdietrich/astropy,dhomeier/astropy,funbaker/astropy,pllim/astropy,mhvk/astropy,larrybradley/astropy,kelle/astropy,bsipocz/astropy,kelle/astropy,saimn/astropy,pllim/astropy,StuartLittlefair/astropy,pllim/astropy,kelle/astropy,mhvk/astropy,AustereCuriosity/astropy,AustereCuriosity/astropy,stargaser/astropy,mhvk/astropy,bsipocz/astropy,dhomeier/astropy,tbabej/astropy,pllim/astropy,mhvk/astropy,dhomeier/astropy,bsipocz/astropy,tbabej/astropy,lpsinger/astropy,StuartLittlefair/astropy,tbabej/astropy,pllim/astropy,aleksandr-bakanov/astropy,AustereCuriosity/astropy,saimn/astropy,AustereCuriosity/astropy,larrybradley/astropy,DougBurke/astropy,larrybradley/astropy,saimn/astropy,lpsinger/astropy,aleksandr-bakanov/astropy,astropy/astropy,astropy/astropy,MSeifert04/astropy,kelle/astropy,DougBurke/astropy,astropy/astropy