Remove old google dependencies and add support for polling.

Dropped AppEngine support. No more base64 encoding. AWS_DEFAULT_REGIO…

…N support. Moved queue_name to the front of the arguments list.

Removed broken features

Added kwargs support for RegisteredTask

LocalTaskQueue w/ multiprocess support

Updated CloudVolume credentials semantics

Can specify lease seconds

Fixed misspelling of qurl in error handling.

import numpy

refactored everything. sqs functionality.