Non-browsing activity for favorite counting

[doublejosh]

Right now getFavoriteTerms() only looks through browsing records. Should be able to access multiple activity records.

Proposing to set these on config or at call time.

[doublejosh]

Could adjust which activities are used when counting taxonomy properties via config...

groucho.config = {
  'taxonomyProperty': 'tags',
  'trackExtent': 25,
  'trackProperties': ['pageId', 'title', 'type', 'tags'],
  'favoriteActivity': ['browsing', 'click']
};

Or that might be something that should be adjustable at call time...

var favActivity = ['browsing', 'click'];
getFavoriteTerms('*', false, threshold, favActivity);

...also, clearly this function needs to change to an options object.

This would affect the "static" favorites, which would be stashed in different forms.