A better fix for the nc out of order problem#28

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kmanley wants to merge 4 commits intoabbot:masterfrom

kmanley:issue-21-track-ncs

Commits on Jan 7, 2016

Merge branch 'issue-21'
Kevin Manley
committed
fix for abbot/go-http-auth#23, support proxy auth
Kevin Manley
committed

Commits on Jan 8, 2016

resolve merge conflicts
Kevin Manley
committed
a better fix for #21; track ncs in a bitset which allows for detecting replays even if ncs arrive out of order
Kevin Manley
committed