add additional flags
Merge branch 'add_AD_and_CD_flags_to_dns.py' of https://github.com/b4ldr/ripe.atlas.sagan into b4ldr-add_AD_and_CD_flags_to_dns.py
Changed cd and ad to booleans
Added tests for .header.ad and .header.cd
Merge branch 'b4ldr-add_AD_and_CD_flags_to_dns.py'