Set version to 1.6.3

Set version to 1.6.2

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Upgrade master version to 1.6.0

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Add new Solidity function type support. Resolve ethereum#604

Convert byte[] -> bytes32 and fail on unknown classes instead of sile…

…ntly encode to byte[0]

(cherry picked from commit 5c02de2)

Fix calculating refund gas. Resolve ethereum#724

(cherry picked from commit 5a05507)
(cherry picked from commit b09c9ba)