Merge branch 'master' into split_geom

# Conflicts:
#	examples2d/sensor2.rs
#	examples3d/sensor3.rs
#	src/dynamics/integration_parameters.rs
#	src/dynamics/solver/parallel_island_solver.rs
#	src/dynamics/solver/velocity_constraint.rs
#	src/dynamics/solver/velocity_ground_constraint.rs
#	src_testbed/nphysics_backend.rs
#	src_testbed/physx_backend.rs
#	src_testbed/testbed.rs

src_testbed/box2d_backend.rs

@@ -219,7 +219,7 @@ impl Box2dWorld {
 
         counters.step_started();
         self.world.step(
-            params.dt(),
+            params.dt,
             params.max_velocity_iterations as i32,
             params.max_position_iterations as i32,
         );