All demos should be run using same maven commands

[vladoschreiner]

All demos should be run using:

mvn clean package
mvn java:exec

[eminn]

How about customer churn predictor and jetleopard which has multiple main classes ?

[eminn]

• [x] cryptocurrency-realtime-trend
• [ ] customer-churn-predictor
• [x] flight-telemetry
• [x] jetloepard
• [x] online-training-traffic-predictor
• [x] realtime-image-recognition

[vladoschreiner]

The main demo "flow" should be available by maven exec:java. Let Riaz and Ben decide which demo flow is main.