alternate68 nits#7

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petertodd wants to merge 5 commits intomorcos:alternate68from

petertodd:2016-01-alternate68-nits

Commits on Jan 14, 2016

Implement SequenceLocks functions
morcos
committed
Add RPC test exercising BIP68 (mempool only)

sdaftuar
authored and
morcos
committed

Commits on Jan 31, 2016