Remove unneeded selectors, share font-family definitions
Share styles between zoom & extent control
Make fullscreen control use shared styles
use button elements and add tooltips to zoomcontrol
use button elements instead of anchor elements and add tooltips to zoomcontrol
Better integration of button tooltips
Sort externs alphabetically
Add VBArray externs
Include VBArray externs in build
Add ol.BrowserFeature.HAS_ARRAY_BUFFER
Add binary support to ol.format.Format
Add ol.binary
Add ol.format.Binary
Add binary support to ol.source.VectorFile
Use «em» for buttons sizing
Make zoom control tip texts configurable
Coding style
Make zoomToExtent control use <button> instead of <a>
Remove Font Awesome

Everything that we need (icon-arrow-left, icon-arrow-right, icon-plus,
icon-minus, icon-download and icon-flag) is already provided by Bootstrap.
Rename ol.Map#render to ol.Map#renderSync