Exclude avatar sizes 16x16, 24x24, 30x30, 40x40, 48x48 and 64x64

[Fusl]

21:27 <Fusl> so looking at https://github.com/ArchiveTeam/tumblr-grab/blob/master/tumblr.lua#L52 i can see that we're excluding 16x16 and 64x64 sized avatars, but what size do we actually want to exclude because i can see a wide variety of different sizes that we may want to include as well that take half of my crawlers time
21:27 <Fusl> 16, 24, 30, 40, 48, 64, 96, 128, 512
21:30 <Fusl> different sizes of avatars i'm so far downloading according to wget.log: http://xor.meo.ws/YNf9yTudvJCd3pBOIyw52PDK8RPwYCP4.txt
21:30 <Fusl> as one can see, 30x30 avatars are VERY common
21:30 <Fusl> as are 24x24 and 40x40
21:31 <Fusl> i'm going to open a PR to exclude everything below 64x64
21:31 <@kiska> Next update: Remove all avatars < 100 x 100 px