Allow write access on downloaded files
Allow write access on downloaded files

Using umask 0000 to allow write access on downloaded files to group and others.
See http://widerin.net/blog/change-umask-in-docker-containers/

This should fix #289
piejanssens/premiumizer,neox387/premiumizer,neox387/premiumizer,piejanssens/premiumizer,piejanssens/premiumizer,piejanssens/premiumizer,neox387/premiumizer,neox387/premiumizer