Py-consul

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Features
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* Add address param to agent.service.register

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Features
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* Add cas param for kv.delete (thanks qix)

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Features
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* Add tag parameter to health.service() (thanks reversefold)

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Features
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* add the keys and separator params to kv.get (thanks Heuriskein)
* add support for the events api (thanks Heuriskein!)

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Features
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* add HTTP check support (thanks JoeHazzers)
* raise ConsulException on kv.get 500 response code (thanks jjpersch)
* add the wait argument to kv.get

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Features
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* add behavior and ttl to session.create
* add session.renew