Merge pull request #24 from ClaesNilsson/master

App2App Messaging API
Merge pull request #25 from ClaesNilsson/master

Discovery API updates
Updates to remove discovery filtering to URI query parameters and go back to the findServices() filter parameter:
* widlprocxmltohtml.xsl: Removed heading text for "Feature" stating filtering through URI query parameters.
* Discovery API: Removed text on filtering with URI query parameters and added two examples in the Filter dictionary section.
* Sensor API: Removed text on filter parameters for Proximity feature.