Fix expansion of operators 'src_port', 'src_portrange' and 'dst_portrange'
Merge pull request #88 from Igalia/fix-port-lowering

Fix expansion of operators 'src_port', 'src_portrange' and 'dst_portrange'
Add flag --bpf-lua so expressions can be compiled using libpcap
Merge pull request #87 from Igalia/pflua-match-libpcap

Add flag --bpf-lua so expressions can be compiled using libpcap
Operators 'ip proto', 'ip6 proto' and 'iso proto' can also accept a number as parameter
Add examples for 'ip proto 47', 'ip6 proto 47', 'proto 47' and 'iso proto 47'
Merge pull request #90 from Igalia/fix-ip-proto

Fix ip proto