set upaxis for all demos (either Y/1 or Z/2)

examples/Constraints/ConstraintDemo.cpp

@@ -100,6 +100,8 @@ void	AllConstraintDemo::setupEmptyDynamicsWorld()
 
 void	AllConstraintDemo::initPhysics()
 {
+	m_guiHelper->setUpAxis(1);
+
 	m_Time = 0;
 
 	setupEmptyDynamicsWorld();

examples/Constraints/Dof6Spring2Setup.cpp

@@ -94,6 +94,8 @@ void Dof6Spring2Setup::initPhysics()
 {
 	// Setup the basic world
 	
+	m_guiHelper->setUpAxis(1);
+
 		m_collisionConfiguration = new btDefaultCollisionConfiguration();
 		m_dispatcher = new btCollisionDispatcher(m_collisionConfiguration);
 		btVector3 worldAabbMin(-10000,-10000,-10000);