Speed up timestamptz decoding#338

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cbandy wants to merge 3 commits intolib:masterfrom

cbandy:timestamptz-decode

Commits on Feb 10, 2015

Function to decode timestamptz to time.Time
cbandy
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Commits on Feb 11, 2015

Assert expected bytes as they are processed
cbandy
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Commits on Feb 15, 2015

Reduce some duplication when decoding timestamptz
cbandy
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