Export HTTP.TransactionOptions

[nodech]

Fixes the style issues in that PR.

Closes #392

[coveralls]

Pull Request Test Coverage Report for Build 1558282263

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 8 unchanged lines in 5 files lost coverage.
• Overall coverage decreased (-0.02%) to 62.488%

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Files with Coverage Reduction	New Missed Lines	%
lib/covenants/rules.js	1	69.11%
lib/protocol/consensus.js	1	82.79%
lib/script/script.js	1	63.25%
lib/net/pool.js	2	30.34%
lib/wallet/http.js	3	63.53%

Totals
Change from base Build 1521306511:	-0.02%
Covered Lines:	21236
Relevant Lines:	31792

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💛 - Coveralls