Make ol.tilegrid.TileGrid#getResolutions method exportable
Merge pull request #2218 from oterral/exports

Add exports
Add ol.Feature#clone
Merge pull request #2138 from probins/mapoptions

Document map options more thoroughly
Merge pull request #2242 from elemoine/feature-clone

Add ol.Feature#clone
Add ol.style.Icon#getImageSize
Add write support to KML format
Add export button to kml example
Add an exampleNS.strToBase64 function

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Base64_encoding_and_decoding
Use exampleNS.strToBase64 in kml example
Minor change to the example externs file
Create valid KML documents

Thanks @bartvde.
Add getRevision to api

The revision can be useful for instance to check if a feature has been modified so I'd like to see it in api.
Merge pull request #2245 from sweco-sebhar/patch-1

Make `ol.Observable#getRevision` exportable.
Add symbol kind to info
Merge pull request #2246 from tschaub/kind

Add symbol kind to info.
Hit detection for features drawn at pre/postcompose
Clone skippedFeatureUids_
Use ol.xml.setAttributeNS for xmlns attributes
Fix nodes order in Placemark and IconStyle