Revert "Merge pull request #151 from brunob/hotfixes"

CORS issues  got fixed on the server (Nominatim) side.

See
https://github.com/twain47/Nominatim/commit/0dd10c3fff9896ca23b884a7ec7a97002065d083
https://github.com/twain47/Nominatim/commit/490190b8739241b84ead87ed47f8a3c65553fe10

http://openlayers.org/api/OpenLayers.js works perfectly now, so no reason to use a fixed old version in the geocoder examples.

This reverts https://github.com/mapstraction/mxn/pull/151