ignore_patterns.singletumblr: Allow a.tumblr.com
ignore_patterns.singletumblr: Allow a.tumblr.com

Allow things like https://a.tumblr.com/tumblr_njvn2jIkir1unm52po1.mp3
served from http://dmcasafe.tumblr.com/post/111195617071/

UncleStranger/grab-site,bright-sparks/grab-site,UncleStranger/grab-site,bright-sparks/grab-site