Add styles for .ol-touch .ol-zoomslider
Fix zoomslider controls to match zoom controls more closely
Update the zoomslider example to have better styling for touch devices
Update zoomslider custom styling to match control styling changes
Mark parts of control and overlay as stable
Fix ol.BrowserFeature.HAS_TOUCH detection code

Use goog.global instead goog.global.document.documentElement to avoid
false negative results when using the chrome development tools (Touch
Events emulation).

Code borrowed from https://github.com/Modernizr/Modernizr/blob/master/feature-detects/touchevents.js
except for the DocumentTouch part which is deprecated (https://developer.mozilla.org/en-US/docs/Web/API/DocumentTouch)

Fixes #1869
Merge pull request #1867 from bartvde/stability

Mark parts of control and overlay as stable
Merge pull request #1870 from fredj/has-touch

Fix ol.BrowserFeature.HAS_TOUCH detection code
Fix vbarray extern

dimension argument is optional.
See http://msdn.microsoft.com/en-us/library/3kk8f869(v=vs.94).aspx
and http://msdn.microsoft.com/en-us/library/0kbz883e(v=vs.94).aspx
Merge pull request #1872 from fredj/vbarray

Fix vbarray extern
Remove tests for spherical geometry on poorly defined points
Fix return types
Fix fixing of OGC stupidity
Parse coordinates in GML in a single pass
Add ol.Sphere#interpolate
Add EPSG:4326 tests
Merge pull request #1873 from twpayne/sphere-interpolate

Add ol.Sphere#interpolate
Do not update RTree while dragging vertices
Skipped features replaces RenderGeometryFunction
Update select-features example styles