Added updated config file within team name, velocity and race-size.

- Changed ‘teams’ to an array containing maps of each team. In each team map, it contains team name and boat velocity.
- Added race size which represents how many boats would compete during a race.

#story[7] #story[8]

doc/examples/config.json

@@ -0,0 +1,13 @@
+{
+  "race-name": "AC35",
+  "time-scale": 1,
+  "race-size": 2,
+  "teams": [
+    {"team-name": "Oracle Team USA", "velocity": 20.9},
+    {"team-name": "Artemis Racing", "velocity": 18.3},
+    {"team-name": "Emirates Team New Zealand", "velocity": 21.5},
+    {"team-name": "Groupama Team France","velocity": 19.9},
+    {"team-name": "Land Rover BAR", "velocity": 17.6},
+    {"team-name": "SoftBank Team Japan", "velocity": 16.6}
+  ]
+}