Correct/improve dragbox docs
Remove libtess.js
Document custom controls
Add tests for ol.coordinate.add().
Add tests for ol.coordinate.createStringXY().
Add tests for ol.coordinate.equals().
Merge pull request #2282 from marcjansen/coordinate-tests

Add more tests to ol.coordinate
Merge pull request #2281 from tschaub/remove-libtess

Remove libtess.js.
Use goog.dom.classlist functions

The goog.dom.classes functions have now been deprecated.  See https://github.com/google/closure-library/commit/97e8a0c0fc7238a56cc4dacd4a96fd4c0735b992
Depends on closure-util version 0.18.0
Fix the closure-library version

The version is the same as the one provided by plovr-81ed862.jar
Merge pull request #2283 from fredj/closure-util.json

Fix the closure-compiler and closure-library versions
Export ol.source.Vector.clear()
Merge pull request #2285 from tsauerwein/vector-source-clear

Export ol.source.Vector.clear()
Export ol.format.GeoJSON.writeGeometry()
Improve docs for define tag
Mark the color argument to ol.color.transform non-nullable

Inside this function goog.vec.Mat4.multVec3 is called and and its
arguments must not be null.
Merge pull request #2287 from tsauerwein/geojson-write-geometry

Export ol.format.GeoJSON.writeGeometry()
Merge pull request #2284 from tschaub/classes

Use `goog.dom.classlist` functions instead of the deprecated `goog.dom.classes` functions.
Merge pull request #2288 from fredj/latest-closure-library

Mark the color argument to ol.color.transform non-nullable