Fix tslint errors

src/engine/Engine.ts

@@ -1165,7 +1165,7 @@ O|===|* >________________>\n\
                game.stop();
                game.onFatalException(e);
             }
-         }
+         };
       }
 
       /**

src/spec/Mocks.ts

@@ -115,9 +115,9 @@ module Mocks {
             screenToWorldCoordinates: ex.Engine.prototype.screenToWorldCoordinates,
             addScene: ex.Engine.prototype.addScene,
             goToScene: ex.Engine.prototype.goToScene,
-            emit: function () { },
+            emit: function () { /* do nothing */  },
             eventDispatcher: {
-               emit: function () { }
+               emit: function () { /* do nothing */  }
             },
             _hasStarted: true,
             _update: (<any>ex.Engine.prototype)._update,
@@ -140,7 +140,7 @@ module Mocks {
                   loop();
                }
             }
-         }
+         };
       }
 
       time(): ITime {
@@ -156,7 +156,7 @@ module Mocks {
             now: function () {
                return now;
             }
-         }
+         };
       }
 
       window() {         

src/spec/TimescalingSpec.ts

@@ -34,7 +34,7 @@ describe('The engine', () => {
       // actor moves twice as fast
       loop.advance(1100);
 
-      expect(actor.x).toBe(10, "actor did not move twice as fast");
+      expect(actor.x).toBe(10, 'actor did not move twice as fast');
 
    });
 
@@ -51,7 +51,7 @@ describe('The engine', () => {
       // actor moves twice as slow
       loop.advance(2000);
 
-      expect(actor.x).toBeCloseTo(5, 0.2, "actor did not move twice as slow");
+      expect(actor.x).toBeCloseTo(5, 0.2, 'actor did not move twice as slow');
 
    });