connect() as separate method (echoromeo#29)

New method get_zone_override_mode (echoromeo#28)

* Fix zone override for a zone protected from global override.
* Expose getting zone override mode.
* Version 1.5.0

Merge pull request echoromeo#24 from oyvindwe/fix-loop

Convert to asyncio.get_running_loop

Merge pull request echoromeo#22 from oyvindwe/devices

Expose known device models

Merge pull request echoromeo#19 from echoromeo/pypi_v200

Prepare for 1.2.0 release

Merge pull request echoromeo#17 from echoromeo/dev_pip

v1.1.2