Promote several properties to API properties.
Promote several properties to API properties.

The properties `multipleKey` and `toggleKey` are used inside the examples
and therefore publicly known anyhow. The properties `onBeforeSelect` and
`scope` are changed to be part of the API for consistency (e.g. `onUnselect`
is part of the API already) and usefullness (we allow the `scope` to be
defined elsewhere in the library as well). The property `renderIntent` is
being promoted as it is very useful and a nice complimentary of the already
public `selectStyle`.

elbakai/openlayers,openlayers/ol2,Gnafu/openlayers,v5analytics/openlayers,pvalsecc/openlayers,PublicStuff/openlayers,adh1365/openlayers,dracic/openlayers,Gnafu/openlayers,dracic/openlayers,avinet/openlayers,Gnafu/openlayers,elbakai/openlayers,pgiraud/openlayers,pvalsecc/openlayers,wet-boew/openlayers,wet-boew/openlayers,dracic/openlayers,sbrunner/openlayers,owenmead/openlayers,sbrunner/openlayers,elbakai/openlayers,georchestra/openlayers,sanak/ol2,shevawen/openlayers,colllin/openlayers,avinet/openlayers,PublicStuff/openlayers,v5analytics/openlayers,colllin/openlayers,sbrunner/openlayers,pgiraud/openlayers,elbakai/openlayers,v5analytics/openlayers,colllin/openlayers,PetrDlouhy/openlayers,pgiraud/openlayers,altamiracorp/openlayers,v5analytics/openlayers,altamiracorp/openlayers,dracic/openlayers,shevawen/openlayers,sanak/ol2,pvalsecc/openlayers,owenmead/openlayers,avinet/openlayers,openlayers/ol2,PetrDlouhy/openlayers,wet-boew/openlayers,sanak/ol2,georchestra/openlayers,colllin/openlayers,PublicStuff/openlayers,sanak/ol2,openlayers/ol2,kartverket/openlayers,owenmead/openlayers,Gnafu/openlayers,wet-boew/openlayers,PublicStuff/openlayers,georchestra/openlayers,kartverket/openlayers,adh1365/openlayers,PetrDlouhy/openlayers,PetrDlouhy/openlayers,pgiraud/openlayers,adh1365/openlayers,sbrunner/openlayers,shevawen/openlayers,shevawen/openlayers,openlayers/ol2,adh1365/openlayers,avinet/openlayers,kartverket/openlayers,kartverket/openlayers,altamiracorp/openlayers,pvalsecc/openlayers,altamiracorp/openlayers,owenmead/openlayers