[galaxy-commits] commit/galaxy-central: greg: 1. Add a new UpdateManager for use with tool shed repositories installed into a local Galaxy instance. The UpdateManager will poll all appropriate tool sheds to see if updates are available for each of the installed repositories. Polling occurs when the Galaxy server is started. In addition, a config setting tells the UpdateManager to poll after the configured number of hours have passed. If updates are available for an installed repository, a table column is up