Should use the event key in the headDocument if it is there

In newer bootstrap init files, the event key will be moved to the headDocument dict since that is updated more frequently than the collectionSettings. Since collectionSettings contains more static data, the data will be old and the stream will need to catch up constantly.
Merge pull request #144 from Livefyre/event_from_init

Should use the event key in the headDocument if it is there