code: function stringifyDirection(dir, oldStyle) {
  		var reNewStyle = /^to\s/;
  		var keys = Object.keys(directions).filter(function(k) {
  			var hasPrefix = reNewStyle.test(k);
  			return oldStyle ? !hasPrefix : hasPrefix;
  		});
  
  		for (var i = 0; i < keys.length; i++) {
  			if (directions[keys[i]] == dir) {
  				return keys[i];
  			}
  		}
  
  		if (oldStyle) {
  			dir = (dir + 270) % 360;
  		}
  
  		return dir + 'deg';
  	}
docs: Tries to find keyword for given direction, expressed in degrees
  @param  {Number} dir Direction (degrees)
  @param {Boolean} oldStyle Use old style keywords (e.g. "top" instead of "to bottom")
  @return {String}     Keyword or <code>Ndeg</code> expression