Remove unneeded type cast
Uppercase ol.format.WFS.FEATURE_PREFIX const
Uppercase ol.format.WFS.XMLNS const
Uppercase ol.format.WFS.SCHEMA_LOCATION const
Merge pull request #3028 from fredj/wfsformat-cleanup

ol.format.WFS cleanup
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
Update closure-util to v1.2.0
Update closure-library version