Add ol.MapBrowserEvent#getBrowserEvent
Avoid firing duplicate change events in ol.layer.Layer
No need for handleLayerChange in base layer
Avoid duplicate change event on visibility change
Remove unused handleLayerVisibleChange
Test change events on layer groups
Merge pull request #1349 from tschaub/fewer-change-events

Clean up layer change event handling.
Add gutter option to ol.source.TileWMS
Add gutter support to TileUrlFunction
Add ol.source.Tile#getGutter
Add gutter support to ol.renderer.canvas.TileLayer
 Add gutter support to ol.renderer.dom.TileLayer
Add gutter support to ol.renderer.webgl.TileLayer
Add missing "new"s in ol.structs.RBush
Merge pull request #1364 from twpayne/rbush-new-error

Add missing "new"s in ol.structs.RBush
No longer generate src/external/src/types.js
File types.js no longer an input for ol-all.js
File types.js no longer an input for ol-simple.js
File types.js no longer an input for ol-whitespace.js
File types.js no longer an input for ol.js