Network Connection Indicator

[edsu]

When the network connection goes away hydrator stops collecting tweets (for obvious reasons) but it does not start again automatically when a network connection is reestablished. This means the operator need to stop and restart the dataset for collection to start again.

When the network is down the dataset should appear to be stopped and there should be a visual indicator that the network connection is down. It should check periodically for the network to come back, and when a connection is reestablished the indicator should go away.