Explicit box model definition for box model dependent sizing

The zoom in/out tooltips are clipped when a css reset sets the
box-sizing to anything other than content-box. This breaks the
sizing of these tooltips, because they rely on content-box
sizing. This issue can e.g. be seen when using a bootstrap 3.x
bootstrap.css
Improve code and apidoc formating
Remove unused ol.format.Polyline.decodeFloat function
Remove unused ol.format.Polyline.decodeSignedInteger function
Remove unused ol.format.Polyline.encodeFloat function
Remove unused ol.format.Polyline.encodeSignedInteger function
Remove unused ol.format.Polyline.decodeUnsignedInteger function
Make renderSync always force a render
Don't use withFrozenRendering in ol.interaction.Interaction.rotateWithoutConstraints
Don't use withFrozenRendering in ol.interaction.Interaction.zoomWithoutConstraints
Don't use withFrozenRendering in ol.interaction.DragRotateAndZoom#handleDragEnd
Don't use withFrozenRendering in ol.interaction.Select#handleMapBrowserEvent
Remove ol.Map#withFrozenRendering
Minor change of wording in `build.py help`.
Merge pull request #1779 from marcjansen/build.py-help

Minor change of wording in `build.py help`.
Remove unused ol.FeatureOverlay require
Merge pull request #1777 from fredj/polyline-cleanup

ol.format.Polyline cleanup
Merge pull request #1780 from fredj/unused-require

Remove unused ol.FeatureOverlay require
Rename ol.format.Format to ol.format.Feature
Rename ol.format.Binary to ol.format.BinaryFeature