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each of these entries initiates a job that runs the before_script
for each instance. yuck.

If the authority waits until the next descriptor submission deadline,
it may miss retrieving the consensus made in the previous epoch and will
not have a copy of the previous consensus from which to inherit the
correct topology. This commit fixes this issue by returning to
stateBootstrap and retrying a consensus fetch for the current epoch.

Return ErrGone, there is no bootstrap for current epoch.

voting client now tries each Address in random order until a
successful connection is made.

Improve Makefile and travis file

allow for separately tuning the mix loop decoy traffic and only give
the client two lambda params: send interval and per hop delay. Removal
of drop decoy lambda.

Nonvoting Authority implementation shares s11n.Document's
VerifyAndParseDocument, so this field is added for compatibility.

this verifies the signed payload, which makes the Epoch field redundant

fixes a rather critical security vulnerability

fixes 2 cases where only the first authority is used to verify the
document.