Physics2D tests (#129)

* Quaternion: Fix singularity on Z axis when converting to euler angles

* CollisionComponent2D: Add method to retrieve AABB

* Collider2D: Fix constructor for Box with Vector2

* Physics2D: Fix rotation (Chipmunk works with radian and Nazara degrees) and copy constructor of RigidBody2D

* Colider2D: Add New for convex and tests for the new classes

src/Nazara/Physics2D/Collider2D.cpp

@@ -31,7 +31,7 @@ namespace Nz
 	/******************************** BoxCollider2D *********************************/
 
 	BoxCollider2D::BoxCollider2D(const Vector2f& size, float radius) :
-	BoxCollider2D(Rectf(-size.x / 2.f, -size.y / 2.f, size.x / 2.f, size.y / 2.f), radius)
+	BoxCollider2D(Rectf(-size.x / 2.f, -size.y / 2.f, size.x, size.y), radius)
 	{
 	}