added simple script to benchmark and measure precision
added simple script to benchmark and measure precision

pombredanne/annoy,codeaudit/annoy,BeifeiZhou/annoy,codeaudit/annoy,spotify/annoy,subu-cliqz/annoy,subu-cliqz/annoy,Houzz/annoy2,eddelbuettel/annoy,pombredanne/annoy,guitarmind/annoy,eddelbuettel/annoy,subu-cliqz/annoy,LongbinChen/annoy2,aimeida/annoy,pombredanne/annoy,guitarmind/annoy,tjrileywisc/annoy,aimeida/annoy,eddelbuettel/annoy,LongbinChen/annoy2,Houzz/annoy2,spotify/annoy,LongbinChen/annoy,spotify/annoy,tjrileywisc/annoy,codeaudit/annoy,eddelbuettel/annoy,tjrileywisc/annoy,LongbinChen/annoy,BeifeiZhou/annoy,guitarmind/annoy,subu-cliqz/annoy,Houzz/annoy2,aimeida/annoy,spotify/annoy,LongbinChen/annoy2,tjrileywisc/annoy,LongbinChen/annoy,BeifeiZhou/annoy,pombredanne/annoy