Add ol.source.ImageWMS#getGetFeatureInfoUrl
Add tests for ol.source.ImageWMS#getGetFeatureInfoUrl
Add ol.source.TileWMS#getGetFeatureInfoUrl
Add tests for ol.source.TileWMS#getGetFeatureInfoUrl
Add GetFeatureInfo example
Add FIXME
Remove old GetFeatureInfo related code
Merge pull request #1547 from elemoine/gfi

Add getGetFeatureInfoUrl methods to ImageWMS and TileWMS sources