SmartWatch support thread

[serbanghita]

Problem It appears that some smartwatches have browsers incorporated in them. If there are enough case studies across the smartwatches industry vendors, then we should create a special method isSmartWatch that aims to detect small surfaces like a watch.

Not sure how relevant is this so let me know your thoughts.

See https://github.com/serbanghita/Mobile-Detect/issues/898