KeyError handling, Shipment.currency property, refactoring#4

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PragmaticMates wants to merge 5 commits intopoundifdef:masterfrom

PragmaticMates:master

Commits on Feb 17, 2014

Commits on Feb 24, 2014

README updated (get_rates)
eriktelepovsky
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Commits on Mar 12, 2014

return label as base64 encoded string
eriktelepovsky
committed