Make ol.Map#isDef checking stricter
Assert that pixel is non-null when positioning overlay
Don't fail when no featues are found in ol.format.TopoJSON
Fix typo in text rendering
Use evt.coordinate instead of evt.getCoordinate()
Add a keyboardEventTarget option to the map

This option allows specifying the element to listen to keyboard events on.
Accept string for keyboardEventTarget option
Change keyboardEventTarget doc as requested by @probins
Supprt parsing of kml:datetime (#1585)

This commit modifies the previous regex used to match following
datetimes:

- 2014
- 2014-02
- 2014-02-15

The new regex also matches dates that were matched by the previous
regex.

This commit also include a unit test for kml:dateTime parsing.
Use projection option instead of reprojectTo

The projection option for vector file sources currently has no good meaning.  The reprojectTo option is used to set the projection for cached features.  This change makes it so the projection option is used for this purpose.  The getProjection method (not currently exported) can then be used to get the cached feature projection.

This also removes the default of 'EPSG:3857' for vector file sources.  If a projection is not configured, features will not be transformed.
Close the polygon created by ol.render.Box
Simplify code in ol.render.Box#createGeometry_
Use coordinate since getCoordinate is deprecated
Fix example
Add swiss extent