Added:

* saref:Device s4wear:measuresFeature saref:FeatureOfInterest
* saref:Device s4wear:controlsFeature saref:FeatureOfInterest
* saref:FeatureOfInterest s4wear:featureIsMeasuredByDevice saref:Device
* saref:FeatureOfInterest s4wear:featureIsControlledByDevice saref:Device

These make redundant the following, so they are removed: s4wear:isSensedBy, s4wear:isActedBy, and s4wear:isActuatedBy.

Closes #17.