Potentialy faster array allocation in rbush
Faster vector source clear

Three seconds speed up for clearing 100'000 features.
Introduce clear event on vector source

Three seconds speed up when clearing 100'000 features.
Clearing is now around 350ms.
Add optional fast parameter for clearing vector source
Add missing properties in olx.control.AttributionOptions typedef
Merge pull request #3013 from gberaudo/performance_vector_source_clear

Improve vector source clear() performance
Merge pull request #3021 from fredj/attribution-options-typedef

Add missing properties in olx.control.AttributionOptions typedef
Remove loader function return type
Merge pull request #3023 from fredj/server-vector-source

Change loader function return type
Add missing gmlFormat to olx.format.WFSOptions
Remove gmlFormat from olx.format.WFSWriteGetFeatureOptions
Merge pull request #3024 from fredj/wfs_gmlFormat

Add missing gmlFormat to olx.format.WFSOptions
Use goog.array.extend instead of ol.array.safeExtend

The upstream implementation now supports large arrays.
See https://github.com/google/closure-library/pull/356
Remove ol.Object.capitalize and use goog.string.capitalize
[wip] Update closure-compiler and closure-library