Add support to sign tx with single key or array of keys#238

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robertdavid010 wants to merge 2 commits intobigchaindb:masterfrom robertdavid010:master

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Commits on Aug 15, 2018

Add support for single and array of private keys
robertdavid010
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Merge pull request #1 from robertdavid010/robertdavid010-patch-1
robertdavid010
authored