Property value and cars

Dear Dan:
Finally! Here is my pull request for both the automotive and the property-values extension proposals, including examples for the use for EXIF meta-data.

I incorporated all feedback from Yandex (Yuliya) and added the requested examples for using property-values for EXIF meta-data. I also added a detailed JSON-LD example for a car and broke down the property-value examples into individual ones.

From my perspective, this should be really ready for deployment now.

You can see a live preview at

    http://sdo-property-value.appspot.com/PropertyValue
    http://sdo-property-value.appspot.com/Car

etc.

If you have any questions, please ping me on Skype; I will try to be around!

All the best

Martin