Python-consul

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* add support for nodemeta to catalog and health end points (thanks
ibrahimmenem)
* update Check.script to use args, as Consul 1.1 has dropped the script
parameter

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* Support for Python 3.4 dropped (sorry)
* Add support for Consul 1.0.0 (thanks matusvalo!)
* Expose all 400 errors and add tests for common callback handler (thanks bagerard)

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* Add header parameter to http check (thanks matusvalo)
* Add basic Transaction HTTP API support (thanks iandyh)
* Fix invalid url error when specifying credentials via host (Issue 167)

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* Add a common base client for shared functionality between different HTTP clients (thanks abn!)
* Fix request quoting issue (thanks abn)
* Fix installation issue due to aiohttp only being available for Python>=3.4.2 (thanks abn)
* Added support for current release of aiohttp (thanks eaterek)
* Improved Tornado example (thanks chriswue)
* Add and use ACL token in Event.fire (thanks illenseer)
* Add client side cert support (thanks brocade-craig)
* Add token params to catalog register (thanks gregdurham)
* Add support for DeregisterCriticalServiceAfter (thanks daroot)
* Improve reliability of test suite (thanks daroot!)
* Update CI: Add py35 and py36 to tests (thanks Poogles)

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Features
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* Add Operator endpoint (thanks bantonj!)

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Bug Fix
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* Tornado backend encoding bug related to None values (thanks plredmond)
* python-consul doesn't support python 2.6 (thanks lowzj)

Maintenance
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* update max ttl to 86400 to conform to consul (thanks philloooo)
* Correct error message in ACL create/update (thanks Crypto89)

Features
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* Catalog API should support tokens (thanks racktear!)
* Allow enable tag override (thanks shalev67!)