encode now-timestamps properly to avoid overwrites #62
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What was happening was that when a timestamp, which are
monotonic-timestamps, included an e.g. ".001" suffix, it would be
considered as "in the future" if the indexer was quick enough to pick it
up, and then be converted to "new Date().getTime()". So if two messages
were written to a channel fast enough, BOTH would get set to "new
Date().getTime()" and the second would overwrite the first in leveldb.
This change ensures that proper monotonic-timestamps are used
throughout.