Fix #508: unify http exceptions#576

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tseaver merged 3 commits intogoogleapis:masterfrom

tseaver:508-unify_http_exceptions

Jan 28, 2015

Commits on Jan 28, 2015

Move 'gcloud.storage.exceptions' -> 'gcloud.exceptions'.
tseaver
committed
Fix response status codes for Unauthorized (401) and Forbidden (403).
tseaver
committed
Use 'make_exception' from 'datastore.connection.Connection._request'.
tseaver
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