Window shade fix#3

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cseymr wants to merge 4 commits intojulienbachmann:masterfrom

cseymr:windowShadeFix

Commits on Aug 2, 2018

Fixes error when setLevel called by windowShade
Craig Seymour
committed

Commits on Aug 18, 2018

fixes incorrect logging statement, and improved number check
Craig Seymour
committed

Commits on Aug 21, 2018

This checks the current level before submitting the request - hopefully this will address the issue reported https://community.smartthings.com/t/fibaro-roller-shutter-2-fgrm-222-dth-in-post-24-uk-d…
Craig Seymour
committed

Commits on Aug 23, 2018

Stops ST sending close/open updates when they are not needed
Craig Seymour
committed