Fix GoogleMaps example view max zoom levels
Restore control’s keyboard navigation
Fixes button handlers event type
Add example combining draw and modify interaction
Export condition singleClick and mouseOnly
Add condition to draw interaction
Remove getSimplifiedGeometry from ol.geom.Circle

The `getSimplifiedGeometry` method is unnecessary as
`ol.geom.SimpleGeometry`'s default implementation is to do the
same thing (return `this`).
Fix typo in comment
Merge pull request #2179 from pagameba/remove-getsimplifiedgeometry

Remove getSimplifiedGeometry from ol.geom.Circle
Merge pull request #2130 from adube/fix-example-gmaps-zooms

Fix GoogleMaps example view max zoom levels
Merge pull request #2168 from tonio/keyboard_controls

Restore control’s keyboard navigation
Merge pull request #2114 from tsauerwein/draw-and-modify

Add example combining draw and modify interaction
Add @todo API and describe ol.geom.Geometry funcs

The `clone()`, `getSimplifiedGeometry()` and `getType()` methods are all
base class methods documented in subclasses.  They should appear in
ol.geom.Geometry in the API docs as well.