renamed the single copies per GeoJSON example in the document to trigger the new GeoJSON display rendering on github
Merge pull request #12 from sdrees/rename-geojson-samples-for-github-awesomeness

Single file copies of our GeoJSON examples are now rendered nicely on Github
Merge branch 'master' of github.com:GeoJSONWG/draft-geojson
Add more background and motivation to the intro.

I've explained the GIS context of the spec and a brief listing of
where it is being used as a demonstration of its popularity and
de-facto standardness.