Pass ghostery pause and whitelisted sites to content scripts.

[sammacbeth]

Allows content scripts to stop processing when the user pauses ghostery.

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[christophertino]

@sammacbeth We should be able to handle the paused state change with a dispatcher event. In PanelData here and here we can add dispatcher.trigger('globals.save.paused_blocking').

In background.js under initializeDispatcher() add a listener for globals.save.paused_blocking and use that to call refreshAppState

[sammacbeth]

@christophertino Thanks, was wondering if there was a nicer way to see when the extension is paused. Updated the PR with your suggestions.