Added function to generate events for race

- added generateEvents() for creating event into a priority queue
- added iterateEvents() to pull out events when time passing
- changed default velocity to 70 just for testing. Pls change it back after testing

#story[5] #implement

src/main/java/seng302/Boat.java

@@ -9,7 +9,7 @@ public class Boat
 {
 	// The name of the team, this is also the name of the boat
 	private String teamName = null;
-	private float velocity = 0;
+	private float velocity = 70; // please set this one to a reasonable num!!!!!, i set it just for testing ;)
 
 	public Boat(String teamName) {
 		this.teamName = teamName;