Allow downloading file by filename

For instance, instead of

http://…/build/3770911/download/4/source.tar.gz

you can get

http://…/build/3770911/download/source.tar.gz

This is useful when file names are constant across builds but product numbers are not.

Created by  Eelco Dolstra  on July 31, 2015
3TZGWQHOP4PQ5YSHETBXAHVQP5QNSPG7QREZCGQ4GF55DZSSHKZAC
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