Bug 867543 - Part 1 - Generalize appbar css, make sprites more robust, move into platform. r=mbrubeck

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extra : rebase_source : d12d41611423782497c03ceb05bd8b40afd1b921
Bug 867543 - Part 2 - Add static labels. r=mbrubeck

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extra : rebase_source : bc7b5b58ecc667982160e325b99a45eb2cd9fd2a
Bug 867543 - Part 3 - Dynamically update and pluralize the labels with all of the correct nouns attached. r=mbrubeck

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extra : rebase_source : b83293bfc40a12983a44e04295380d127c8b7227