code: public Color setColor(String color) {
  		Color prop = (color == null) ? null : new Color(color);
  		setColor(prop);
  		return prop;
  	}
docs: Sets the color that clients may use when displaying the journal entry
  (for example, a background color).
  @param color the color name (case insensitive) or null to remove.
  Acceptable values are defined in <a
  href="https://www.w3.org/TR/2011/REC-css3-color-20110607/#svg-color"
  >Section 4.3 of the CSS Color Module Level 3 Recommendation</a>. For
  example, "aliceblue", "green", "navy".
  @return the property object that was created
  @see <a
  href="http://tools.ietf.org/html/draft-ietf-calext-extensions-01#page-9">draft-ietf-calext-extensions-01
  p.9</a>