Menubar icon doesn't work on dark mode.

[franzf]

OSX Yosemite has a "dark mode" for the user interface, in which the menubar background goes from light grey to dark grey and the text and most menubar app icons are white.

Airlift doesn't adapt to this. The icon stays black, rendering it almost invisible on the dark background.

(Obviously no background-colour awareness either when colour icons selected, but at least visibility isn't an issue then.)

Desired behaviour: Awareness of the configured foreground and background colours in the menubar in Yosemite, and changing the colour or inverting the palette of the monochrome icon to match.

Further reading: http://indiestack.com/2014/10/yosemites-dark-mode/ (how to use image templates to fix that).