Correct the equation for computeHeading() in Spherical.js, incorrect delta Longitude #1413
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The current implementation of OpenLayers.Spherical.computeHeading() is wrong based on the relevant [link](http://www.movable-type.co.uk/scripts/latlong.html) listed in Spherical.js. The delta of the longitudes is reversed in both the 'y' and the 'x' portion of the equations. Instead of `from.lon - to.lon`, it should be `to.lon - from.lon`.
mrmattson
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The current implementation of OpenLayers.Spherical.computeHeading() is wrong based on the relevant link listed in Spherical.js. The delta of the longitudes is reversed in both the 'y' and the 'x' portion of the equations. Instead of
from.lon - to.lon, it should beto.lon - from.lon.