Task-queue

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* chore: version 0.11.0
* feat: block\_until\_empty() which polls every 2 seconds by default
* docs: docstring for poll function

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* feat: automatic serialization for objects with 'serialize'

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* chore: fix \_\_version\_\_ specification

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* feat: add \_\_version\_\_ number
* refactor: remove old google code to remove a dependency
* feat: add "poll" method based on igneous's task\_execution model
* fix: PrintTask initialize arguments

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* fix: actual backwards compatibility with python2
* docs: pip installation instructions were pointing to wrong package
* docs: add PyPI badge
* fix: generalize string types for python2 and 3
* refactor: drop appengine support, base64encoding
* docs: add Travis CI badge to README
* fix: enqueued measures both visible and non-visible messages on aws
* refactor: upgrade to inspect.getfullargspec
* refactor: move queue\_name and queue\_server to first arguments
* feat: allow specification of SQS queues via queue name only
* chore: change tab width to 2

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* test: switching to new credentials
* fix: add back google-api-python-client
* docs: more info on CloudVolume dependency
* docs: added info on CloudVolume dependency
* test: install numpy first for CloudVolume compatibility
* docs: more explicit about how to set up secrets
* docs: made PrintTask example more explicit
* docs: update readme to be more general
* feat: remove broken Google support