This is the entry in programmers.txt I used when I used the pololu programmer
pololu.name=Pololu USB AVR Programmer
pololu.communication=serial
pololu.protocol=avrispv2
edit:
and in boards.txt uncomment pololu programmer
# The following DO work (pick one)...
#attiny85at16e.upload.using=arduino:arduinoisp
# attiny85at16e.upload.protocol=avrispv2
attiny85at16e.upload.using=pololu