Remove download_url from setup.py
Remove download_url from setup.py

Cadair/astropy-helpers,dpshelio/astropy-helpers,bsipocz/astropy-helpers,larrybradley/astropy-helpers,astropy/astropy-helpers,dpshelio/astropy-helpers,larrybradley/astropy-helpers,larrybradley/astropy-helpers,astropy/astropy-helpers,bsipocz/astropy-helpers,Cadair/astropy-helpers,bsipocz/astropy-helpers