Use ol.projection.identityTransform instead of goog.functions.identity
Add default CSS style for mouse position

Missing CSS was confirmed with issue #680, this commit is to fix it and change
ol-mouse-position class to ol-mouseposition. I choose for the moment the top
right corner to display the coordinates from mouse position control because of
potential conflict with the scaleline control.
Improvements for xmleql

This adds some improvements for the xmleql test assertion. When passed in a
document, use the documentElement. Also improve error reporting as suggested
by @tschaub.
Merge pull request #687 from fredj/geolocation

Use ol.projection.identityTransform instead of goog.functions.identity
Merge pull request #691 from elemoine/mouseposition

Add default CSS for mouse position control
Merge pull request #689 from bartvde/xmleql4

Improvements for xmleql (r=@ahocevar)