Added taxonomy matchip file to compare NHM taxonomy with birdtree.org. NHM uses Peters taxonomy, obtained from Avibase (D. Lepage, J. Warnier, 2014. The Peters' Check-list of the Birds of the World (1931-1987) Database. Accessed on 01/09/2014 from Avibase, the World Database: http://avibase.bsc-eoc.org/peterschecklist.jsp.)