square / beancounter / 154

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master: 41%

Pull #21

travis-ci-com

Implement backend.ChainHeight()

The code already existed for Btcd, but the Electrum backend needed some
work.

Exposing the chain height is useful for two reasons:
1. it enables us to make the --block-height parameter optional and
default to current height - 6.
2. it enables binary searching for a block given a timestamp.

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