This adds a bit more inconsistency to the library, but we didn't have complete consistency before. Almost all existing string enum values are lowercase (a couple are camelCase and one is dash-separated). The closure library isn't consistent either (with case for enum properties or values). I imagine this could be justified in saying someone could blindly use GeoJSON type values in places, but in the end, you'll need to read the docs before guessing right.
This separates the action of requesting an extent to be loaded from the action of requesting cached features. The renderer (or any other consumer of a vector source) calls load to request a data extent. A `featureload` event fires when new features are loaded. The renderer (or any other consumer) separately asks for cached features given an extent. This vector source only loads features once, but this separation will also work with sources that make multiple requests for data in different extents.
This also removes the `data` option from the vector source in favor of a `features` option. Since we no longer have shared data structures for geometries, people can manually create features and pass them to a vector source. The `addFeatures` method is exported as well. This is used to add features to a source that don't have a representation on the "remote" (or server).
This moves the feature cache from ol.layer.Vector to ol.source.Vector. These are the minimum changes required to maintain the existing functionality and make tests pass. More refactoring to come.
This is one more step to bring the master and vector-api
branches closer together. I am well aware that the current
Modify interaction will probably be rewritten as part of the
vector-api effort, but with changes like this we will eventually
be able to remove ol.structs.RTree from master.
