Test writer with list of columns.
Test writer with list of columns.

StuartLittlefair/astropy,mhvk/astropy,larrybradley/astropy,larrybradley/astropy,pllim/astropy,aleksandr-bakanov/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,larrybradley/astropy,larrybradley/astropy,saimn/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,lpsinger/astropy,astropy/astropy,mhvk/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,saimn/astropy,pllim/astropy,astropy/astropy,saimn/astropy,lpsinger/astropy,astropy/astropy,astropy/astropy,aleksandr-bakanov/astropy,saimn/astropy,pllim/astropy,pllim/astropy,mhvk/astropy,larrybradley/astropy,lpsinger/astropy,astropy/astropy,lpsinger/astropy,StuartLittlefair/astropy,mhvk/astropy,mhvk/astropy,saimn/astropy,pllim/astropy