5.1.7 20170616
* Prep removal of SetOptions alternatives
* Restore webpage upgrade error messages removed in 5.1.5
* Add hold button functionality to buttons 2 to 4
* Add command SetOption32 1..100 to set Key Hold Time from 0.1 seconds
to 10 seconds (#200)
* Allow slashes in Topic, GroupTopic, ButtonTopic and SwitchTopic (#507)
* Changed webpage form actions from post to get and use relative path
url (#434, #522)
d763fd52eb