Change color of menu and options text

[peterennis]

I did the following expecting text to be yellow but it is still dark green,
i.e. the 'primary' color.

[Sebastián Ferreras]

I think it may be related to a CSS specificity problem. Anyway, I've updated the component to add some classes to each type of option, so now it should be easier to change the styles. Please check the Theming section for more information.

I'll close this issue since this feature was added to the master branch, but feel free to re-open it if you need any help. Thanks :)