SentimentBolt tested and working

- Topology: put default command line args back in place (in comment)
- added cluster shutdown code (just in case this was causing the data feed to hang?)
- ApiStreamingSpout: redeclared the criteria field to track + added code to log rate limiting by Twitter
- SentimentBolt: documented code + emit track, tweet and annotated sentiment to the output collector

Signed-off-by: Olivier Van Laere <oliviervanlaere@gmail.com>