Int64 unpack fixes#4

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loughmiller wants to merge 4 commits intobinaryjs:masterfrom

loughmiller:int64-unpack-fixes

Commits on Sep 9, 2013

add unit tests to reproduce int64 bugs
Scott Loughmiller
committed
readUInt64 - refence buffer array inside object returned from slice
Scott Loughmiller
committed
readInt64 should call readUInt64, not itself recursively
Scott Loughmiller
committed

Commits on Jan 15, 2014

use patched buffercursor
Scott Loughmiller
committed