Relayr

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Feature release moving from Pubnub to MQTT.

* removed pubnub dependency in favour of MQTT
* removed all pubnub-related API endpoints
* added initial support for accessing historical data
* added isodate and certifi dependencies (removing handling
of dedicated relayr MQTT certificate file)
* added simple Flask-based web application with OAuth2 login on relayr.io

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Bugfix release.

* added fetching and caching of remote certificate file for MQTT connections
* fixed compatibility issues with Python 2.6
* changed parameters for sending commands to devices
* added new endpoint specifically for controlling a WunderBar device LED
* fixed default usage of tox

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Maintenance release.

* made pexpect a conditional requirement on non-Windows platforms
* added transport channels to relayr API
* added new MQTT data streams which will eventually replace PubNub channels
* pinned versions of pubnub==3.7.1 and the new paho-mqtt==1.1 dependancies

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Bugfix release.

* adapted data receiving example in README
* updated to latest version numbers in documentation

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Bugfix release.

* removed PyBluez dependancy
* removed Pubnub version pinning
* made publisher.get_apps() return App objects
* added distinction between public and private devices

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First public release.

* applied refactorings
* added demos
* improved documentation and tests