Cirrus Background doesn't work

[learnspyral]

The code for setting the background colour doesn't work.
myCorpus.tool("Cirrus", {style: "background: blue"});
Is this no longer possible?

[ajmacdonald]

Good catch. This functionality was lost at a certain point and needs to be re-included.

[ajmacdonald]

Note to self: https://github.com/voyanttools/Voyant/blob/master/src/main/webapp/app/panel/Cirrus.js#L429