bug 934760 - add strings for webapp update notifications; r=mfinkle

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extra : rebase_source : 1f12db36cf7eab72103f310fc3ac59e9493e8348
bug 934760 - refactor DOMApplicationRegistry.checkForUpdate to expose updateHostedApp/updatePackagedApp; r=fabrice"

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extra : rebase_source : 5cc51a4d8f57e6a3ed8cc88df5b96e0dd4088565
bug 962607 - automatically enable remote debugger when native app built in debug mode; r=mfinkle

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extra : rebase_source : eee7d323b3dcb2a8911f855d81a80ae9a75d3204