v0.12.1-bitcore-3

• Uses logical times for the timestamp index for deterministic range queries, in block order, between two timestamps. This will apply to all timestamp indexes going forward, and with a reindex will apply to all past timestamp indexes. The logical time of a block is actual timestamp of the block, unless it is less than (earlier) the previous block's logical time, and in that case it is one second greater than the previous block's logical time. This keeps the timestamp index sorted in the same order as the blocks. #29
• Fixes a bug with the addressindex test so that the tests will be deterministic. #30

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