SpendingCondition: use ripemd160(length, sha3(bytecode)) instead of just using ripemd160

[pinkiebell]

Bounty

leap-node should use ripemd160(length, sha3(bytecode)) for spencon¹ addresses

Scope

• update checkSpendingCondition

Deliverables

• updated code
• updated unit tests

Gain for the project

Publicly visible delivery

Roles

bounty worker: name / 50% bounty reviewer: name / 50% (security related)

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¹ — Spending Condition