Allow FTP TLS as an optional handler for downloads
Allow FTP TLS as an optional handler for downloads

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