* PlaceDataSource framework, stub drivers, plus the administration controller changes & views for PlaceDataSource administration.

* First draft of the ArcGIS REST driver.

* Updated of setup.php controller for table structures, esp re PlaceDataSource model.

* README now mentions docs subfolder.
* Updated error message in EventDataSource driver, when an unknown subclass is mentioned. Now mentions the stated "type" for debugging.
Simple whitespace fix, is all