Updates to support parameters for discovery

...onally extend the Feature URI when used in the serviceType parameter in findServices(). The purpose is to create a flexble "REST-style" way of refining the search for services.

Sensor, contacts, Actuators, Context, AppLauncher, MediaContent, Messaging, NFC, Payment, Vehicle, Widget: Feature URIs updated.

widlprocxmltohtml.xsl: Introduction text to Feature section updated to describe the option with query parameters.