Move PredictionIntegrationService implementation into its own class.
Return a static bundle identifier for OBANYC components rather than null.

The SearchServiceImpl breaks if the bundle identifier is null; we don't really have anything useful to give it, but any string is better than null in this case.
Refactor BundleSearchServiceImpl to avoid returning duplicate suggestions (store in a set rather than a list), and suggest stop codes rather than stop IDs if enabled.