Add single image WMS with custom projection example
Fix reference and title according to @erilem comments.
Change the way the projection is managed and use ol.projection.configureProj4jsProjection
Add a zoomslider control.
Simplify example and let it use real resolutions.

Thanks to @twpayne for the suggestion.
Use OSM resolutions as fallback resolutions.

Hat tip to @twpayne for suggesting this change in the defaults.
Add an assertion to the dragchange handler.

This ensures that the result of resolution calculation stays inside of the
allowed bounds.
Unregister previous event listeners, if any.

Thanks for spotting this, @twpayne.
More specific argument type of callback method.
Correct API documentation.
Use getContentBoxSize() for slider initialisation.

Initial note to revisit this came from @twpayne; thanks.
Don't use non-exported method in example.
Remove CSS workarounds as suggested by @fredj.
Fix check for unused goog.require directives
Adjust test syntax.
Remove unused goog.require directives
Merge pull request #345 from marcjansen/zoomslider-own-ui-2

Add a zoomslider control. (r=@twpayne,@elemoine,@fredj)
Merge pull request #364 from bbinet/fix-check-requires

Fix check for unused goog.require directives
Remove unused goog.require directives
Add ScaleLine control to wms-custom-proj example

This requires using Proj4js, and configuring it with an extent.