lib/Nagios/NRPE/Packet.pm: rename _crc32 to crc32
t/packet.t tests for Nagios::NRPE::Packet
Build.PL: add requirements
.gitignore: add test.pl
lib/Nagios/NRPE.pm: add DESCRIPTION
lib/Nagios/NRPE/Daemon.pm: complete daemon