mapbox/tilemill — comment on commit 7ccd9a99c32b0550c2b8aa77623df8d9802d0529
File: views/Layer.bones line 83
By springmeyer:

in millstone as least I added `.tsv` and `.txt` to detect/assume as other valid tabular extension that we should treat as csv's by passing to mapnik's csv plugin. Do these seem reasonable and if so should they also be added here? Also, if they seem extraneous feel free to remove from millstone. .txt seemed reasonable to me because the geonames csv's have that ext and .tsv seemed reasonable because google refine exportes tab delimited files with this ext.