Re: [manifest] Add icons_background_color instead of background_color (#387)

Just FYI, we're planning on using the theme_color behind the icon in multiple places in Firefox OS. In the browser chrome, and as a background colour for "cards" (with an opacity of <1).

See https://wiki.mozilla.org/FirefoxOS/Pin_the_Web

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https://github.com/w3c/manifest/pull/387#issuecomment-119180712