Use goog.dom.fullscreen
Merge pull request #2315 from tschaub/full-screen

Use goog.dom.fullscreen.
Export transform

ol.ObjectAccessor#transform is used in the bind-input example. Why the
example works without this export is a mystery to me. Either way, we
will want this in the docs.
Merge pull request #2317 from ahocevar/export-transform

Make transform exportable
Download and use new proj4js
Update externs and ol.HAVE_PROJ4JS for new proj4js API
Update API to work with custom transforms, including proj4js

All transparent proj4js handling is now in ol.proj.get, and a new
addCoordinateTransforms function makes it easy to configure custom
transform functions. ol.Proj4jsProjection is no longer needed.
Update tests
Update example to show manual proj4js configuration
Update example to show transparent proj4js integration